13981394 has 16 divisors (see below), whose sum is σ = 24053568. Its totient is φ = 5970672.

The previous prime is 13981381. The next prime is 13981399. The reversal of 13981394 is 49318931.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (13981399) 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 7 ways as a sum of consecutive naturals, for example, 2672 + ... + 5924.

It is an arithmetic number, because the mean of its divisors is an integer number (1503348).

Almost surely, 2^13981394 is an apocalyptic number.

13981394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

13981394 is a deficient number, since it is larger than the sum of its proper divisors (10072174).

13981394 is a wasteful number, since it uses less digits than its factorization.

13981394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3569.

The product of its digits is 23328, while the sum is 38.

The square root of 13981394 is about 3739.1702288075. The cubic root of 13981394 is about 240.9074097815.

The spelling of 13981394 in words is "thirteen million, nine hundred eighty-one thousand, three hundred ninety-four".