15309242 has 16 divisors (see below), whose sum is σ = 24796800. Its totient is φ = 7046832.

The previous prime is 15309241. The next prime is 15309271. The reversal of 15309242 is 24290351.

It is a super-2 number, since 2×15309242² = 468745781229128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (15309241) 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, 15083 + ... + 16065.

It is an arithmetic number, because the mean of its divisors is an integer number (1549800).

Almost surely, 2^15309242 is an apocalyptic number.

15309242 is a deficient number, since it is larger than the sum of its proper divisors (9487558).

15309242 is a wasteful number, since it uses less digits than its factorization.

15309242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 15309242 is about 3912.7026465092. The cubic root of 15309242 is about 248.3044842343.

Adding to 15309242 its reverse (24290351), we get a palindrome (39599593).

It can be divided in two parts, 15309 and 242, that added together give a palindrome (15551).

The spelling of 15309242 in words is "fifteen million, three hundred nine thousand, two hundred forty-two".