15138550 has 72 divisors (see below), whose sum is σ = 33841584. Its totient is φ = 5019840.

The previous prime is 15138523. The next prime is 15138581. The reversal of 15138550 is 5583151.

It is a super-2 number, since 2×15138550² = 458351392205000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 90567 + ... + 90733.

It is an arithmetic number, because the mean of its divisors is an integer number (470022).

Almost surely, 2^15138550 is an apocalyptic number.

15138550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15138550 is an abundant number, since it is smaller than the sum of its proper divisors (18703034).

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

15138550 is a wasteful number, since it uses less digits than its factorization.

15138550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 15138550 is about 3890.8289605173. The cubic root of 15138550 is about 247.3782007919.

The spelling of 15138550 in words is "fifteen million, one hundred thirty-eight thousand, five hundred fifty".