400533220 has 24 divisors (see below), whose sum is σ = 844329024. Its totient is φ = 159602016.

The previous prime is 400533193. The next prime is 400533229. The reversal of 400533220 is 22335004.

It is not an unprimeable number, because it can be changed into a prime (400533229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32814 + ... + 43333.

It is an arithmetic number, because the mean of its divisors is an integer number (35180376).

Almost surely, 2^400533220 is an apocalyptic number.

It is an amenable number.

400533220 is an abundant number, since it is smaller than the sum of its proper divisors (443795804).

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

400533220 is a wasteful number, since it uses less digits than its factorization.

400533220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76419 (or 76417 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 400533220 is about 20013.3260604029. The cubic root of 400533220 is about 737.1335542349.

Adding to 400533220 its reverse (22335004), we get a palindrome (422868224).

The spelling of 400533220 in words is "four hundred million, five hundred thirty-three thousand, two hundred twenty".