400055820 has 24 divisors (see below), whose sum is σ = 1120156464. Its totient is φ = 106681536.

The previous prime is 400055809. The next prime is 400055827. The reversal of 400055820 is 28550004.

It is not an unprimeable number, because it can be changed into a prime (400055827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3333739 + ... + 3333858.

It is an arithmetic number, because the mean of its divisors is an integer number (46673186).

Almost surely, 2^400055820 is an apocalyptic number.

It is an amenable number.

400055820 is an abundant number, since it is smaller than the sum of its proper divisors (720100644).

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

400055820 is a wasteful number, since it uses less digits than its factorization.

400055820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6667609 (or 6667607 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 400055820 is about 20001.3954513179. The cubic root of 400055820 is about 736.8405719069.

The spelling of 400055820 in words is "four hundred million, fifty-five thousand, eight hundred twenty".