13920439 has 4 divisors (see below), whose sum is σ = 14991256. Its totient is φ = 12849624.

The previous prime is 13920427. The next prime is 13920449. The reversal of 13920439 is 93402931.

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 13920439 - 2¹⁷ = 13789367 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 13920439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13920419) 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, 535389 + ... + 535414.

It is an arithmetic number, because the mean of its divisors is an integer number (3747814).

Almost surely, 2^13920439 is an apocalyptic number.

13920439 is a deficient number, since it is larger than the sum of its proper divisors (1070817).

13920439 is a wasteful number, since it uses less digits than its factorization.

13920439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070816.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 13920439 is about 3731.0104529470. The cubic root of 13920439 is about 240.5568032746.

The spelling of 13920439 in words is "thirteen million, nine hundred twenty thousand, four hundred thirty-nine".