639200431 has 2 divisors, whose sum is σ = 639200432. Its totient is φ = 639200430.

The previous prime is 639200407. The next prime is 639200437. The reversal of 639200431 is 134002936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639200431 - 2⁵ = 639200399 is a prime.

It is a super-2 number, since 2×639200431² = 817154381981171522, 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 639200431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639200437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319600215 + 319600216.

It is an arithmetic number, because the mean of its divisors is an integer number (319600216).

Almost surely, 2^639200431 is an apocalyptic number.

639200431 is a deficient number, since it is larger than the sum of its proper divisors (1).

639200431 is an equidigital number, since it uses as much as digits as its factorization.

639200431 is an evil number, because the sum of its binary digits is even.

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

The square root of 639200431 is about 25282.4134726098. The cubic root of 639200431 is about 861.4148474585.

The spelling of 639200431 in words is "six hundred thirty-nine million, two hundred thousand, four hundred thirty-one".