13920139 has 4 divisors (see below), whose sum is σ = 14148400. Its totient is φ = 13691880.

The previous prime is 13920133. The next prime is 13920143. The reversal of 13920139 is 93102931.

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

It is a cyclic number.

It is not a de Polignac number, because 13920139 - 2²³ = 5531531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13920133) 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, 114039 + ... + 114160.

It is an arithmetic number, because the mean of its divisors is an integer number (3537100).

Almost surely, 2^13920139 is an apocalyptic number.

13920139 is a deficient number, since it is larger than the sum of its proper divisors (228261).

13920139 is an equidigital number, since it uses as much as digits as its factorization.

13920139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228260.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 13920139 is about 3730.9702491443. The cubic root of 13920139 is about 240.5550751788. Note that the first 3 decimals are identical.

The spelling of 13920139 in words is "thirteen million, nine hundred twenty thousand, one hundred thirty-nine".