13889021 has 8 divisors (see below), whose sum is σ = 14217984. Its totient is φ = 13562640.

The previous prime is 13888997. The next prime is 13889027. The reversal of 13889021 is 12098831.

13889021 = T₄₅₈ + T₄₅₉ + ... + T₅₆₃.

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 13889021 - 2²² = 9694717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13889027) 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, 13880 + ... + 14846.

It is an arithmetic number, because the mean of its divisors is an integer number (1777248).

Almost surely, 2^13889021 is an apocalyptic number.

It is an amenable number.

13889021 is a deficient number, since it is larger than the sum of its proper divisors (328963).

13889021 is an equidigital number, since it uses as much as digits as its factorization.

13889021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 13889021 is about 3726.7976870230. The cubic root of 13889021 is about 240.3756905309.

The spelling of 13889021 in words is "thirteen million, eight hundred eighty-nine thousand, twenty-one".