15001990 has 48 divisors (see below), whose sum is σ = 29840400. Its totient is φ = 5422592.

The previous prime is 15001981. The next prime is 15001991. The reversal of 15001990 is 9910051.

15001990 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 (15001991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83721 + ... + 83899.

It is an arithmetic number, because the mean of its divisors is an integer number (621675).

Almost surely, 2^15001990 is an apocalyptic number.

15001990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15001990 is a deficient number, since it is larger than the sum of its proper divisors (14838410).

15001990 is a wasteful number, since it uses less digits than its factorization.

15001990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 15001990 is about 3873.2402455825. The cubic root of 15001990 is about 246.6321130886.

The spelling of 15001990 in words is "fifteen million, one thousand, nine hundred ninety".