15990442 has 12 divisors (see below), whose sum is σ = 25973190. Its totient is φ = 7380048.

The previous prime is 15990437. The next prime is 15990473. The reversal of 15990442 is 24409951.

It can be written as a sum of positive squares in 3 ways, for example, as 4626801 + 11363641 = 2151^2 + 3371^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15990398 and 15990407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23317 + ... + 23992.

Almost surely, 2^15990442 is an apocalyptic number.

15990442 is a deficient number, since it is larger than the sum of its proper divisors (9982748).

15990442 is a wasteful number, since it uses less digits than its factorization.

15990442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47337 (or 47324 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 15990442 is about 3998.8050715182. The cubic root of 15990442 is about 251.9340236285.

It can be divided in two parts, 159 and 90442, that added together give a square (90601 = 301²).

The spelling of 15990442 in words is "fifteen million, nine hundred ninety thousand, four hundred forty-two".