15440431404 has 12 divisors (see below), whose sum is σ = 36027673304. Its totient is φ = 5146810464.

The previous prime is 15440431397. The next prime is 15440431451. The reversal of 15440431404 is 40413404451.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×15440431404² (a number of 21 digits) contains 22 as substring.

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, 643351297 + ... + 643351320.

Almost surely, 2^15440431404 is an apocalyptic number.

It is an amenable number.

15440431404 is an abundant number, since it is smaller than the sum of its proper divisors (20587241900).

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

15440431404 is a wasteful number, since it uses less digits than its factorization.

15440431404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286702624 (or 1286702622 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 15440431404 its reverse (40413404451), we get a palindrome (55853835855).

The spelling of 15440431404 in words is "fifteen billion, four hundred forty million, four hundred thirty-one thousand, four hundred four".