15138685 has 4 divisors (see below), whose sum is σ = 18166428. Its totient is φ = 12110944.

The previous prime is 15138679. The next prime is 15138689. The reversal of 15138685 is 58683151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58683151 = 653 ⋅89867.

It can be written as a sum of positive squares in 2 ways, for example, as 9018009 + 6120676 = 3003^2 + 2474^2 .

It is a cyclic number.

It is not a de Polignac number, because 15138685 - 2³ = 15138677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15138689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1513864 + ... + 1513873.

It is an arithmetic number, because the mean of its divisors is an integer number (4541607).

Almost surely, 2^15138685 is an apocalyptic number.

It is an amenable number.

15138685 is a deficient number, since it is larger than the sum of its proper divisors (3027743).

15138685 is an equidigital number, since it uses as much as digits as its factorization.

15138685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3027742.

The product of its digits is 28800, while the sum is 37.

The square root of 15138685 is about 3890.8463089667. The cubic root of 15138685 is about 247.3789361322.

The spelling of 15138685 in words is "fifteen million, one hundred thirty-eight thousand, six hundred eighty-five".