406405256 has 8 divisors (see below), whose sum is σ = 762009870. Its totient is φ = 203202624.

The previous prime is 406405229. The next prime is 406405261. The reversal of 406405256 is 652504604.

It can be written as a sum of positive squares in only one way, i.e., 325225156 + 81180100 = 18034^2 + 9010^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25400321 + ... + 25400336.

Almost surely, 2^406405256 is an apocalyptic number.

It is an amenable number.

406405256 is a deficient number, since it is larger than the sum of its proper divisors (355604614).

406405256 is a wasteful number, since it uses less digits than its factorization.

406405256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50800663 (or 50800659 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 406405256 is about 20159.4954301937. The cubic root of 406405256 is about 740.7183528372.

The spelling of 406405256 in words is "four hundred six million, four hundred five thousand, two hundred fifty-six".