13921825 has 12 divisors (see below), whose sum is σ = 17459820. Its totient is φ = 11010560.

The previous prime is 13921819. The next prime is 13921849. The reversal of 13921825 is 52812931.

It can be written as a sum of positive squares in 6 ways, for example, as 16384 + 13905441 = 128^2 + 3729^2 .

It is not a de Polignac number, because 13921825 - 2¹⁹ = 13397537 is a prime.

It is a super-2 number, since 2×13921825² = 387634422661250, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 904 + ... + 5353.

It is an arithmetic number, because the mean of its divisors is an integer number (1454985).

Almost surely, 2^13921825 is an apocalyptic number.

It is an amenable number.

13921825 is a deficient number, since it is larger than the sum of its proper divisors (3537995).

13921825 is an equidigital number, since it uses as much as digits as its factorization.

13921825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6356 (or 6351 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 13921825 is about 3731.1961888917. The cubic root of 13921825 is about 240.5647867552.

The spelling of 13921825 in words is "thirteen million, nine hundred twenty-one thousand, eight hundred twenty-five".