400220424 has 48 divisors (see below), whose sum is σ = 1131062400. Its totient is φ = 127605984.

The previous prime is 400220419. The next prime is 400220459. The reversal of 400220424 is 424022004.

400220424 is a `hidden beast` number, since 400 + 220 + 42 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 400220397 and 400220406.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119184 + ... + 122495.

It is an arithmetic number, because the mean of its divisors is an integer number (23563800).

Almost surely, 2^400220424 is an apocalyptic number.

It is an amenable number.

400220424 is an abundant number, since it is smaller than the sum of its proper divisors (730841976).

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

400220424 is a wasteful number, since it uses less digits than its factorization.

400220424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241714 (or 241707 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 400220424 is about 20005.5098410413. The cubic root of 400220424 is about 736.9416163684.

Adding to 400220424 its reverse (424022004), we get a palindrome (824242428).

The spelling of 400220424 in words is "four hundred million, two hundred twenty thousand, four hundred twenty-four".