13903921 has 8 divisors (see below), whose sum is σ = 14410880. Its totient is φ = 13405392.

The previous prime is 13903889. The next prime is 13903949. The reversal of 13903921 is 12930931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13903921 - 2⁵ = 13903889 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 13903921.

It is not an unprimeable number, because it can be changed into a prime (13903121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1351 + ... + 5443.

It is an arithmetic number, because the mean of its divisors is an integer number (1801360).

Almost surely, 2^13903921 is an apocalyptic number.

It is an amenable number.

13903921 is a deficient number, since it is larger than the sum of its proper divisors (506959).

13903921 is an equidigital number, since it uses as much as digits as its factorization.

13903921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 13903921 is about 3728.7961864387. The cubic root of 13903921 is about 240.4616173404.

The spelling of 13903921 in words is "thirteen million, nine hundred three thousand, nine hundred twenty-one".