15998404 has 12 divisors (see below), whose sum is σ = 28286524. Its totient is φ = 7916544.

The previous prime is 15998383. The next prime is 15998407. The reversal of 15998404 is 40489951.

15998404 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 2 ways, for example, as 6708100 + 9290304 = 2590^2 + 3048^2 .

It is not an unprimeable number, because it can be changed into a prime (15998407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20229 + ... + 21004.

Almost surely, 2^15998404 is an apocalyptic number.

It is an amenable number.

15998404 is a deficient number, since it is larger than the sum of its proper divisors (12288120).

15998404 is a wasteful number, since it uses less digits than its factorization.

15998404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41334 (or 41332 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 15998404 is about 3999.8004950247. The cubic root of 15998404 is about 251.9758312254.

The spelling of 15998404 in words is "fifteen million, nine hundred ninety-eight thousand, four hundred four".