400554220 has 24 divisors (see below), whose sum is σ = 917633808. Its totient is φ = 145656000.

The previous prime is 400554197. The next prime is 400554251. The reversal of 400554220 is 22455004.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 400554191 and 400554200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 910131 + ... + 910570.

It is an arithmetic number, because the mean of its divisors is an integer number (38234742).

Almost surely, 2^400554220 is an apocalyptic number.

It is an amenable number.

400554220 is an abundant number, since it is smaller than the sum of its proper divisors (517079588).

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

400554220 is a wasteful number, since it uses less digits than its factorization.

400554220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820721 (or 1820719 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 400554220 is about 20013.8507039500. The cubic root of 400554220 is about 737.1464366737.

The spelling of 400554220 in words is "four hundred million, five hundred fifty-four thousand, two hundred twenty".