405874639 has 2 divisors, whose sum is σ = 405874640. Its totient is φ = 405874638.

The previous prime is 405874631. The next prime is 405874681. The reversal of 405874639 is 936478504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405874639 - 2³ = 405874631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405874631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202937319 + 202937320.

It is an arithmetic number, because the mean of its divisors is an integer number (202937320).

Almost surely, 2^405874639 is an apocalyptic number.

405874639 is a deficient number, since it is larger than the sum of its proper divisors (1).

405874639 is an equidigital number, since it uses as much as digits as its factorization.

405874639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 405874639 is about 20146.3306584599. The cubic root of 405874639 is about 740.3958431229.

The spelling of 405874639 in words is "four hundred five million, eight hundred seventy-four thousand, six hundred thirty-nine".