400720228 has 12 divisors (see below), whose sum is σ = 704585392. Its totient is φ = 199410120.

The previous prime is 400720217. The next prime is 400720253. The reversal of 400720228 is 822027004.

It is a super-2 number, since 2×400720228² = 321153402256743968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236550 + ... + 238237.

Almost surely, 2^400720228 is an apocalyptic number.

It is an amenable number.

400720228 is a deficient number, since it is larger than the sum of its proper divisors (303865164).

400720228 is a wasteful number, since it uses less digits than its factorization.

400720228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475002 (or 475000 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 400720228 is about 20017.9976021579. The cubic root of 400720228 is about 737.2482583480.

The spelling of 400720228 in words is "four hundred million, seven hundred twenty thousand, two hundred twenty-eight".