15387990 has 32 divisors (see below), whose sum is σ = 37034496. Its totient is φ = 4092000.

The previous prime is 15387979. The next prime is 15388007. The reversal of 15387990 is 9978351.

It is a happy number.

It is a congruent number.

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, 20115 + ... + 20865.

It is an arithmetic number, because the mean of its divisors is an integer number (1157328).

Almost surely, 2^15387990 is an apocalyptic number.

15387990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15387990 is an abundant number, since it is smaller than the sum of its proper divisors (21646506).

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

15387990 is a wasteful number, since it uses less digits than its factorization.

15387990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 15387990 is about 3922.7528599187. The cubic root of 15387990 is about 248.7295009327.

The spelling of 15387990 in words is "fifteen million, three hundred eighty-seven thousand, nine hundred ninety".