1309242 has 32 divisors (see below), whose sum is σ = 2903040. Its totient is φ = 390320.

The previous prime is 1309237. The next prime is 1309249. The reversal of 1309242 is 2429031.

It is a super-2 number, since 2×1309242² = 3428229229128, which contains 22 as substring.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1309249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5359 + ... + 5597.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2^1309242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451520).

1309242 is an abundant number, since it is smaller than the sum of its proper divisors (1593798).

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

1309242 is a wasteful number, since it uses less digits than its factorization.

1309242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1309242 is about 1144.2211324740. The cubic root of 1309242 is about 109.3973099524.

It can be divided in two parts, 1309 and 242, that added together give a palindrome (1551).

The spelling of 1309242 in words is "one million, three hundred nine thousand, two hundred forty-two".