639200399 has 2 divisors, whose sum is σ = 639200400. Its totient is φ = 639200398.

The previous prime is 639200381. The next prime is 639200407. The reversal of 639200399 is 993002936.

It is a happy number.

639200399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639200399 - 2²⁴ = 622423183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639200699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319600199 + 319600200.

It is an arithmetic number, because the mean of its divisors is an integer number (319600200).

Almost surely, 2^639200399 is an apocalyptic number.

639200399 is a deficient number, since it is larger than the sum of its proper divisors (1).

639200399 is an equidigital number, since it uses as much as digits as its factorization.

639200399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 639200399 is about 25282.4128397588. The cubic root of 639200399 is about 861.4148330837.

The spelling of 639200399 in words is "six hundred thirty-nine million, two hundred thousand, three hundred ninety-nine".