15992002 has 32 divisors (see below), whose sum is σ = 27708912. Its totient is φ = 6856704.

The previous prime is 15991993. The next prime is 15992017. The reversal of 15992002 is 20029951.

It is a Cunningham number, because it is equal to 3999²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 7177041 + 8814961 = 2679^2 + 2969^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42688 + ... + 43060.

Almost surely, 2^15992002 is an apocalyptic number.

15992002 is a deficient number, since it is larger than the sum of its proper divisors (11716910).

15992002 is a wasteful number, since it uses less digits than its factorization.

15992002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 15992002 is about 3999.0001250313. Note that the first 3 decimals coincide. The cubic root of 15992002 is about 251.9422161120.

The spelling of 15992002 in words is "fifteen million, nine hundred ninety-two thousand, two".