15901990 has 16 divisors (see below), whose sum is σ = 30825648. Its totient is φ = 5871456.

The previous prime is 15901957. The next prime is 15901997. The reversal of 15901990 is 9910951.

15901990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15901997) 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, 61032 + ... + 61291.

It is an arithmetic number, because the mean of its divisors is an integer number (1926603).

Almost surely, 2^15901990 is an apocalyptic number.

15901990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15901990 is a deficient number, since it is larger than the sum of its proper divisors (14923658).

15901990 is a wasteful number, since it uses less digits than its factorization.

15901990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122343.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 15901990 is about 3987.7299306748. The cubic root of 15901990 is about 251.4686355442.

The spelling of 15901990 in words is "fifteen million, nine hundred one thousand, nine hundred ninety".