405428856 has 32 divisors (see below), whose sum is σ = 1158368640. Its totient is φ = 115836768.

The previous prime is 405428839. The next prime is 405428857. The reversal of 405428856 is 658824504.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405428857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1206466 + ... + 1206801.

It is an arithmetic number, because the mean of its divisors is an integer number (36199020).

Almost surely, 2^405428856 is an apocalyptic number.

It is an amenable number.

405428856 is an abundant number, since it is smaller than the sum of its proper divisors (752939784).

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

405428856 is a wasteful number, since it uses less digits than its factorization.

405428856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413283 (or 2413279 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 42.

The square root of 405428856 is about 20135.2639913163. The cubic root of 405428856 is about 740.1246782864.

The spelling of 405428856 in words is "four hundred five million, four hundred twenty-eight thousand, eight hundred fifty-six".