408129856 has 28 divisors (see below), whose sum is σ = 828722752. Its totient is φ = 199317888.

The previous prime is 408129809. The next prime is 408129857. The reversal of 408129856 is 658921804.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408129857) 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, 71400 + ... + 76903.

Almost surely, 2^408129856 is an apocalyptic number.

It is an amenable number.

408129856 is an abundant number, since it is smaller than the sum of its proper divisors (420592896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

408129856 is a wasteful number, since it uses less digits than its factorization.

408129856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148358 (or 148348 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 408129856 is about 20202.2240359818. The cubic root of 408129856 is about 741.7646320845.

The spelling of 408129856 in words is "four hundred eight million, one hundred twenty-nine thousand, eight hundred fifty-six".