13921493 has 2 divisors, whose sum is σ = 13921494. Its totient is φ = 13921492.

The previous prime is 13921489. The next prime is 13921513. The reversal of 13921493 is 39412931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13823524 + 97969 = 3718^2 + 313^2 .

It is a cyclic number.

It is not a de Polignac number, because 13921493 - 2² = 13921489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13921403) 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 as a sum of consecutive naturals, namely, 6960746 + 6960747.

It is an arithmetic number, because the mean of its divisors is an integer number (6960747).

Almost surely, 2^13921493 is an apocalyptic number.

It is an amenable number.

13921493 is a deficient number, since it is larger than the sum of its proper divisors (1).

13921493 is an equidigital number, since it uses as much as digits as its factorization.

13921493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 13921493 is about 3731.1516988726. The cubic root of 13921493 is about 240.5628744546.

The spelling of 13921493 in words is "thirteen million, nine hundred twenty-one thousand, four hundred ninety-three".