808400057 has 4 divisors (see below), whose sum is σ = 808459236. Its totient is φ = 808340880.

The previous prime is 808400039. The next prime is 808400059. The reversal of 808400057 is 750004808.

808400057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 749171641 + 59228416 = 27371^2 + 7696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-808400057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 808399996 and 808400032.

It is not an unprimeable number, because it can be changed into a prime (808400059) 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, 2507 + ... + 40287.

It is an arithmetic number, because the mean of its divisors is an integer number (202114809).

Almost surely, 2^808400057 is an apocalyptic number.

It is an amenable number.

808400057 is a deficient number, since it is larger than the sum of its proper divisors (59179).

808400057 is a wasteful number, since it uses less digits than its factorization.

808400057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59178.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 808400057 is about 28432.3769143559. The cubic root of 808400057 is about 931.5555947832. Note that the first 4 decimals are identical.

The spelling of 808400057 in words is "eight hundred eight million, four hundred thousand, fifty-seven".