13939021 has 4 divisors (see below), whose sum is σ = 13952700. Its totient is φ = 13925344.

The previous prime is 13938983. The next prime is 13939069. The reversal of 13939021 is 12093931.

13939021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12093931 = 37 ⋅326863.

It can be written as a sum of positive squares in 2 ways, for example, as 7236100 + 6702921 = 2690^2 + 2589^2 .

It is a cyclic number.

It is not a de Polignac number, because 13939021 - 2¹⁷ = 13807949 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 (13939621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5176 + ... + 7393.

It is an arithmetic number, because the mean of its divisors is an integer number (3488175).

Almost surely, 2^13939021 is an apocalyptic number.

It is an amenable number.

13939021 is a deficient number, since it is larger than the sum of its proper divisors (13679).

13939021 is a wasteful number, since it uses less digits than its factorization.

13939021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13678.

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

The square root of 13939021 is about 3733.4998325968. The cubic root of 13939021 is about 240.6637931720.

The spelling of 13939021 in words is "thirteen million, nine hundred thirty-nine thousand, twenty-one".