2639431 has 2 divisors, whose sum is σ = 2639432. Its totient is φ = 2639430.

The previous prime is 2639419. The next prime is 2639447. The reversal of 2639431 is 1349362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2639431 - 2⁷ = 2639303 is a prime.

It is a super-2 number, since 2×2639431² = 13933192007522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2639431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2639401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319715 + 1319716.

It is an arithmetic number, because the mean of its divisors is an integer number (1319716).

2^2639431 is an apocalyptic number.

2639431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639431 is an equidigital number, since it uses as much as digits as its factorization.

2639431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

The square root of 2639431 is about 1624.6325738455. The cubic root of 2639431 is about 138.1985345160.

The spelling of 2639431 in words is "two million, six hundred thirty-nine thousand, four hundred thirty-one".