2539139 has 4 divisors (see below), whose sum is σ = 2571360. Its totient is φ = 2506920.

The previous prime is 2539123. The next prime is 2539151. The reversal of 2539139 is 9319352.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2539139 - 2⁴ = 2539123 is a prime.

It is a super-2 number, since 2×2539139² = 12894453722642, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2539189) 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, 15992 + ... + 16149.

It is an arithmetic number, because the mean of its divisors is an integer number (642840).

2^2539139 is an apocalyptic number.

2539139 is a deficient number, since it is larger than the sum of its proper divisors (32221).

2539139 is an equidigital number, since it uses as much as digits as its factorization.

2539139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32220.

The product of its digits is 7290, while the sum is 32.

The square root of 2539139 is about 1593.4676024319. The cubic root of 2539139 is about 136.4254804867.

The spelling of 2539139 in words is "two million, five hundred thirty-nine thousand, one hundred thirty-nine".