15920139 has 4 divisors (see below), whose sum is σ = 21226856. Its totient is φ = 10613424.

The previous prime is 15920131. The next prime is 15920141. The reversal of 15920139 is 93102951.

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

It is not a de Polignac number, because 15920139 - 2³ = 15920131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15920131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2653354 + ... + 2653359.

It is an arithmetic number, because the mean of its divisors is an integer number (5306714).

Almost surely, 2^15920139 is an apocalyptic number.

15920139 is a deficient number, since it is larger than the sum of its proper divisors (5306717).

15920139 is an equidigital number, since it uses as much as digits as its factorization.

15920139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306716.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 15920139 is about 3990.0048872151. The cubic root of 15920139 is about 251.5642665334.

The spelling of 15920139 in words is "fifteen million, nine hundred twenty thousand, one hundred thirty-nine".