400024220 has 24 divisors (see below), whose sum is σ = 846469008. Its totient is φ = 158787200.

The previous prime is 400024213. The next prime is 400024241. The reversal of 400024220 is 22420004.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 400024195 and 400024204.

It is a congruent number.

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, 73721 + ... + 78960.

It is an arithmetic number, because the mean of its divisors is an integer number (35269542).

Almost surely, 2^400024220 is an apocalyptic number.

It is an amenable number.

400024220 is an abundant number, since it is smaller than the sum of its proper divisors (446444788).

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

400024220 is a wasteful number, since it uses less digits than its factorization.

400024220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152821 (or 152819 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 400024220 is about 20000.6054908345. The cubic root of 400024220 is about 736.8211706351.

Adding to 400024220 its reverse (22420004), we get a palindrome (422444224).

The spelling of 400024220 in words is "four hundred million, twenty-four thousand, two hundred twenty".