15231442 has 12 divisors (see below), whose sum is σ = 23094666. Its totient is φ = 7534080.

The previous prime is 15231421. The next prime is 15231479. The reversal of 15231442 is 24413251.

15231442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 15202201 + 29241 = 3899^2 + 171^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23442 + ... + 24082.

Almost surely, 2^15231442 is an apocalyptic number.

15231442 is a deficient number, since it is larger than the sum of its proper divisors (7863224).

15231442 is an equidigital number, since it uses as much as digits as its factorization.

15231442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 752 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 15231442 is about 3902.7480062131. The cubic root of 15231442 is about 247.8831503812.

Adding to 15231442 its reverse (24413251), we get a palindrome (39644693).

The spelling of 15231442 in words is "fifteen million, two hundred thirty-one thousand, four hundred forty-two".