13901921 has 8 divisors (see below), whose sum is σ = 15198624. Its totient is φ = 12610720.

The previous prime is 13901891. The next prime is 13901929. The reversal of 13901921 is 12910931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13901921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13901929) 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, 5381 + ... + 7533.

It is an arithmetic number, because the mean of its divisors is an integer number (1899828).

Almost surely, 2^13901921 is an apocalyptic number.

13901921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13901921 is the 2153-rd octagonal number.

It is an amenable number.

13901921 is a deficient number, since it is larger than the sum of its proper divisors (1296703).

13901921 is a wasteful number, since it uses less digits than its factorization.

13901921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 13901921 is about 3728.5279937262. The cubic root of 13901921 is about 240.4500871086.

The spelling of 13901921 in words is "thirteen million, nine hundred one thousand, nine hundred twenty-one".