408856457 has 4 divisors (see below), whose sum is σ = 409397316. Its totient is φ = 408315600.

The previous prime is 408856439. The next prime is 408856463. The reversal of 408856457 is 754658804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164121721 + 244734736 = 12811^2 + 15644^2 .

It is a cyclic number.

It is not a de Polignac number, because 408856457 - 2¹⁴ = 408840073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (408856157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269294 + ... + 270807.

It is an arithmetic number, because the mean of its divisors is an integer number (102349329).

Almost surely, 2^408856457 is an apocalyptic number.

It is an amenable number.

408856457 is a deficient number, since it is larger than the sum of its proper divisors (540859).

408856457 is an equidigital number, since it uses as much as digits as its factorization.

408856457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540858.

The product of its (nonzero) digits is 1075200, while the sum is 47.

The square root of 408856457 is about 20220.1992324507. The cubic root of 408856457 is about 742.2045634669.

The spelling of 408856457 in words is "four hundred eight million, eight hundred fifty-six thousand, four hundred fifty-seven".