406336639 has 2 divisors, whose sum is σ = 406336640. Its totient is φ = 406336638.

The previous prime is 406336613. The next prime is 406336681. The reversal of 406336639 is 936633604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 406336639 - 2¹⁵ = 406303871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406336439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203168319 + 203168320.

It is an arithmetic number, because the mean of its divisors is an integer number (203168320).

Almost surely, 2^406336639 is an apocalyptic number.

406336639 is a deficient number, since it is larger than the sum of its proper divisors (1).

406336639 is an equidigital number, since it uses as much as digits as its factorization.

406336639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 40.

The square root of 406336639 is about 20157.7935052426. The cubic root of 406336639 is about 740.6766631435.

The spelling of 406336639 in words is "four hundred six million, three hundred thirty-six thousand, six hundred thirty-nine".