2639139 has 4 divisors (see below), whose sum is σ = 3518856. Its totient is φ = 1759424.

The previous prime is 2639111. The next prime is 2639149. The reversal of 2639139 is 9319362.

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 2639139 - 2⁵ = 2639107 is a prime.

It is a super-2 number, since 2×2639139² = 13930109322642, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2639149) 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, 439854 + ... + 439859.

It is an arithmetic number, because the mean of its divisors is an integer number (879714).

2^2639139 is an apocalyptic number.

2639139 is a deficient number, since it is larger than the sum of its proper divisors (879717).

2639139 is an equidigital number, since it uses as much as digits as its factorization.

2639139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879716.

The product of its digits is 8748, while the sum is 33.

The square root of 2639139 is about 1624.5427048865. The cubic root of 2639139 is about 138.1934380312.

The spelling of 2639139 in words is "two million, six hundred thirty-nine thousand, one hundred thirty-nine".