402916639 has 2 divisors, whose sum is σ = 402916640. Its totient is φ = 402916638.

The previous prime is 402916607. The next prime is 402916663. The reversal of 402916639 is 936619204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402916639 - 2⁵ = 402916607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402916699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201458319 + 201458320.

It is an arithmetic number, because the mean of its divisors is an integer number (201458320).

Almost surely, 2^402916639 is an apocalyptic number.

402916639 is a deficient number, since it is larger than the sum of its proper divisors (1).

402916639 is an equidigital number, since it uses as much as digits as its factorization.

402916639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 402916639 is about 20072.7835389116. The cubic root of 402916639 is about 738.5927962582.

The spelling of 402916639 in words is "four hundred two million, nine hundred sixteen thousand, six hundred thirty-nine".