15252639 has 4 divisors (see below), whose sum is σ = 20336856. Its totient is φ = 10168424.

The previous prime is 15252631. The next prime is 15252641. The reversal of 15252639 is 93625251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93625251 = 3 ⋅31208417.

It is a cyclic number.

It is not a de Polignac number, because 15252639 - 2³ = 15252631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15252631) 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, 2542104 + ... + 2542109.

It is an arithmetic number, because the mean of its divisors is an integer number (5084214).

Almost surely, 2^15252639 is an apocalyptic number.

15252639 is a deficient number, since it is larger than the sum of its proper divisors (5084217).

15252639 is an equidigital number, since it uses as much as digits as its factorization.

15252639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5084216.

The product of its digits is 16200, while the sum is 33.

The square root of 15252639 is about 3905.4627126629. The cubic root of 15252639 is about 247.9980868305.

The spelling of 15252639 in words is "fifteen million, two hundred fifty-two thousand, six hundred thirty-nine".