1213842 has 16 divisors (see below), whose sum is σ = 2774592. Its totient is φ = 346800.

The previous prime is 1213841. The next prime is 1213873. The reversal of 1213842 is 2483121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213841) 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, 14409 + ... + 14492.

It is an arithmetic number, because the mean of its divisors is an integer number (173412).

2^1213842 is an apocalyptic number.

1213842 is an abundant number, since it is smaller than the sum of its proper divisors (1560750).

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

1213842 is a wasteful number, since it uses less digits than its factorization.

1213842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28913.

The product of its digits is 384, while the sum is 21.

The square root of 1213842 is about 1101.7449795665. The cubic root of 1213842 is about 106.6728880920.

Adding to 1213842 its reverse (2483121), we get a palindrome (3696963).

It can be divided in two parts, 12138 and 42, that multiplied together give a square (509796 = 714²).

The spelling of 1213842 in words is "one million, two hundred thirteen thousand, eight hundred forty-two".