15139988 has 12 divisors (see below), whose sum is σ = 27141492. Its totient is φ = 7385280.

The previous prime is 15139987. The next prime is 15140011. The reversal of 15139988 is 88993151.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6543364 + 8596624 = 2558^2 + 2932^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15139987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45995 + ... + 46322.

It is an arithmetic number, because the mean of its divisors is an integer number (2261791).

Almost surely, 2^15139988 is an apocalyptic number.

It is an amenable number.

15139988 is a deficient number, since it is larger than the sum of its proper divisors (12001504).

15139988 is a wasteful number, since it uses less digits than its factorization.

15139988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92362 (or 92360 counting only the distinct ones).

The product of its digits is 77760, while the sum is 44.

The square root of 15139988 is about 3891.0137496545. The cubic root of 15139988 is about 247.3860333032.

The spelling of 15139988 in words is "fifteen million, one hundred thirty-nine thousand, nine hundred eighty-eight".