15642139 has 8 divisors (see below), whose sum is σ = 16600320. Its totient is φ = 14707176.

The previous prime is 15642127. The next prime is 15642163. The reversal of 15642139 is 93124651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15642139 - 2¹¹ = 15640091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15642139.

It is not an unprimeable number, because it can be changed into a prime (15642119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4407 + ... + 7120.

It is an arithmetic number, because the mean of its divisors is an integer number (2075040).

Almost surely, 2^15642139 is an apocalyptic number.

15642139 is a deficient number, since it is larger than the sum of its proper divisors (958181).

15642139 is a wasteful number, since it uses less digits than its factorization.

15642139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11609.

The product of its digits is 6480, while the sum is 31.

The square root of 15642139 is about 3955.0144121103. The cubic root of 15642139 is about 250.0913745987.

The spelling of 15642139 in words is "fifteen million, six hundred forty-two thousand, one hundred thirty-nine".