400220124 has 24 divisors (see below), whose sum is σ = 934230528. Its totient is φ = 133351920.

The previous prime is 400220111. The next prime is 400220129. The reversal of 400220124 is 421022004.

It is a super-2 number, since 2×400220124² = 320352295309150752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400220129) 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, 32739 + ... + 43269.

It is an arithmetic number, because the mean of its divisors is an integer number (38926272).

Almost surely, 2^400220124 is an apocalyptic number.

It is an amenable number.

400220124 is an abundant number, since it is smaller than the sum of its proper divisors (534010404).

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

400220124 is a wasteful number, since it uses less digits than its factorization.

400220124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13705 (or 13703 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 400220124 is about 20005.5023431055. The cubic root of 400220124 is about 736.9414322345.

Adding to 400220124 its reverse (421022004), we get a palindrome (821242128).

The spelling of 400220124 in words is "four hundred million, two hundred twenty thousand, one hundred twenty-four".