13439021 has 8 divisors (see below), whose sum is σ = 13816824. Its totient is φ = 13063680.

The previous prime is 13439017. The next prime is 13439033. The reversal of 13439021 is 12093431.

It can be written as a sum of positive squares in 4 ways, for example, as 36100 + 13402921 = 190^2 + 3661^2 .

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 13439021 - 2² = 13439017 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 (13439071) 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, 17375 + ... + 18131.

It is an arithmetic number, because the mean of its divisors is an integer number (1727103).

Almost surely, 2^13439021 is an apocalyptic number.

It is an amenable number.

13439021 is a deficient number, since it is larger than the sum of its proper divisors (377803).

13439021 is an equidigital number, since it uses as much as digits as its factorization.

13439021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 13439021 is about 3665.9270314615. The cubic root of 13439021 is about 237.7511050541.

The spelling of 13439021 in words is "thirteen million, four hundred thirty-nine thousand, twenty-one".