15240400402 has 8 divisors (see below), whose sum is σ = 22872556476. Its totient is φ = 7616214912.

The previous prime is 15240400391. The next prime is 15240400411. The reversal of 15240400402 is 20400404251.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15240149401 + 251001 = 123451^2 + 501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1987863 + ... + 1995514.

Almost surely, 2^15240400402 is an apocalyptic number.

15240400402 is a deficient number, since it is larger than the sum of its proper divisors (7632156074).

15240400402 is a wasteful number, since it uses less digits than its factorization.

15240400402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985292.

The product of its (nonzero) digits is 1280, while the sum is 22.

Adding to 15240400402 its reverse (20400404251), we get a palindrome (35640804653).

The spelling of 15240400402 in words is "fifteen billion, two hundred forty million, four hundred thousand, four hundred two".