400120220 has 24 divisors (see below), whose sum is σ = 862963584. Its totient is φ = 155722176.

The previous prime is 400120207. The next prime is 400120223. The reversal of 400120220 is 22021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400120223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269612 + ... + 271091.

It is an arithmetic number, because the mean of its divisors is an integer number (35956816).

Almost surely, 2^400120220 is an apocalyptic number.

It is an amenable number.

400120220 is an abundant number, since it is smaller than the sum of its proper divisors (462843364).

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

400120220 is a wasteful number, since it uses less digits than its factorization.

400120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540749 (or 540747 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 400120220 is about 20003.0052742082. The cubic root of 400120220 is about 736.8801080453.

Adding to 400120220 its reverse (22021004), we get a palindrome (422141224).

The spelling of 400120220 in words is "four hundred million, one hundred twenty thousand, two hundred twenty".