15238139 has 4 divisors (see below), whose sum is σ = 17415024. Its totient is φ = 13061256.

The previous prime is 15238127. The next prime is 15238141. The reversal of 15238139 is 93183251.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15238139 - 2⁴ = 15238123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15238109) 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, 1088432 + ... + 1088445.

It is an arithmetic number, because the mean of its divisors is an integer number (4353756).

Almost surely, 2^15238139 is an apocalyptic number.

15238139 is a deficient number, since it is larger than the sum of its proper divisors (2176885).

15238139 is an equidigital number, since it uses as much as digits as its factorization.

15238139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176884.

The product of its digits is 6480, while the sum is 32.

The square root of 15238139 is about 3903.6058971162. The cubic root of 15238139 is about 247.9194750272.

The spelling of 15238139 in words is "fifteen million, two hundred thirty-eight thousand, one hundred thirty-nine".