13921438 has 4 divisors (see below), whose sum is σ = 20882160. Its totient is φ = 6960718.

The previous prime is 13921429. The next prime is 13921451. The reversal of 13921438 is 83412931.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3480358 + ... + 3480361.

It is an arithmetic number, because the mean of its divisors is an integer number (5220540).

Almost surely, 2^13921438 is an apocalyptic number.

13921438 is a deficient number, since it is larger than the sum of its proper divisors (6960722).

13921438 is an equidigital number, since it uses as much as digits as its factorization.

13921438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6960721.

The product of its digits is 5184, while the sum is 31.

The square root of 13921438 is about 3731.1443284869. The cubic root of 13921438 is about 240.5625576549.

The spelling of 13921438 in words is "thirteen million, nine hundred twenty-one thousand, four hundred thirty-eight".