400646220 has 48 divisors (see below), whose sum is σ = 1208104800. Its totient is φ = 98620416.

The previous prime is 400646173. The next prime is 400646237. The reversal of 400646220 is 22646004.

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 15 ways as a sum of consecutive naturals, for example, 256045 + ... + 257604.

It is an arithmetic number, because the mean of its divisors is an integer number (25168850).

Almost surely, 2^400646220 is an apocalyptic number.

It is an amenable number.

400646220 is an abundant number, since it is smaller than the sum of its proper divisors (807458580).

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

400646220 is a wasteful number, since it uses less digits than its factorization.

400646220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513674 (or 513672 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 400646220 is about 20016.1489802609. The cubic root of 400646220 is about 737.2028687182.

The spelling of 400646220 in words is "four hundred million, six hundred forty-six thousand, two hundred twenty".