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BaseRepresentation
bin10011011010
31201000
4103122
514432
65430
73423
oct2332
91630
101242
11a2a
12876
13747
1464a
1557c
hex4da

1242 has 16 divisors (see below), whose sum is σ = 2880. Its totient is φ = 396.

The previous prime is 1237. The next prime is 1249. The reversal of 1242 is 2421.

1242 is nontrivially palindromic in base 8, base 11 and base 13.

1242 is an esthetic number in base 12, because in such base its adjacent digits differ by 1.

It is a Harshad number since it is a multiple of its sum of digits (9).

1242 is an undulating number in base 11 and base 13.

It is a plaindrome in base 15.

It is a nialpdrome in base 6 and base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43 + ... + 65.

It is an arithmetic number, because the mean of its divisors is an integer number (180).

1242 is the 18-th decagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1440).

1242 is an abundant number, since it is smaller than the sum of its proper divisors (1638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242 is a wasteful number, since it uses less digits than its factorization.

1242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34 (or 28 counting only the distinct ones).

The product of its digits is 16, while the sum is 9.

The square root of 1242 is about 35.2420203734. The cubic root of 1242 is about 10.7491436130.

Adding to 1242 its reverse (2421), we get a palindrome (3663).

It can be divided in two parts, 1 and 242, that added together give a 5-th power (243 = 35).

The spelling of 1242 in words is "one thousand, two hundred forty-two", and thus it is an iban number.

Divisors: 1 2 3 6 9 18 23 27 46 54 69 138 207 414 621 1242