15990906 has 16 divisors (see below), whose sum is σ = 32506848. Its totient is φ = 5242800.

The previous prime is 15990901. The next prime is 15990907. The reversal of 15990906 is 60909951.

It is not an unprimeable number, because it can be changed into a prime (15990901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21480 + ... + 22211.

It is an arithmetic number, because the mean of its divisors is an integer number (2031678).

Almost surely, 2^15990906 is an apocalyptic number.

15990906 is an abundant number, since it is smaller than the sum of its proper divisors (16515942).

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

15990906 is a wasteful number, since it uses less digits than its factorization.

15990906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43757.

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 15990906 is about 3998.8630884290. The cubic root of 15990906 is about 251.9364604228.

The spelling of 15990906 in words is "fifteen million, nine hundred ninety thousand, nine hundred six".