15139387 has 4 divisors (see below), whose sum is σ = 15365416. Its totient is φ = 14913360.

The previous prime is 15139381. The next prime is 15139391. The reversal of 15139387 is 78393151.

It is a happy number.

15139387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78393151 = 131 ⋅598421.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15139387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15139381) 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, 112914 + ... + 113047.

It is an arithmetic number, because the mean of its divisors is an integer number (3841354).

Almost surely, 2^15139387 is an apocalyptic number.

15139387 is a deficient number, since it is larger than the sum of its proper divisors (226029).

15139387 is an equidigital number, since it uses as much as digits as its factorization.

15139387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226028.

The product of its digits is 22680, while the sum is 37.

The square root of 15139387 is about 3890.9365196569. The cubic root of 15139387 is about 247.3827598314.

The spelling of 15139387 in words is "fifteen million, one hundred thirty-nine thousand, three hundred eighty-seven".