400220442 has 24 divisors (see below), whose sum is σ = 871509600. Its totient is φ = 132735240.

The previous prime is 400220419. The next prime is 400220459. The reversal of 400220442 is 244022004.

400220442 is a `hidden beast` number, since 4 + 0 + 0 + 220 + 442 = 666.

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

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, 52284 + ... + 59447.

It is an arithmetic number, because the mean of its divisors is an integer number (36312900).

Almost surely, 2^400220442 is an apocalyptic number.

400220442 is an abundant number, since it is smaller than the sum of its proper divisors (471289158).

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

400220442 is a wasteful number, since it uses less digits than its factorization.

400220442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111938 (or 111935 counting only the distinct ones).

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

The square root of 400220442 is about 20005.5102909174. The cubic root of 400220442 is about 736.9416274165.

Adding to 400220442 its reverse (244022004), we get a palindrome (644242446).

The spelling of 400220442 in words is "four hundred million, two hundred twenty thousand, four hundred forty-two".