400545772 has 24 divisors (see below), whose sum is σ = 809660880. Its totient is φ = 171356160.

The previous prime is 400545763. The next prime is 400545773. The reversal of 400545772 is 277545004.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (400545773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266997 + ... + 268492.

It is an arithmetic number, because the mean of its divisors is an integer number (33735870).

Almost surely, 2^400545772 is an apocalyptic number.

It is an amenable number.

400545772 is an abundant number, since it is smaller than the sum of its proper divisors (409115108).

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

400545772 is a wasteful number, since it uses less digits than its factorization.

400545772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535521 (or 535519 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 34.

The square root of 400545772 is about 20013.6396489994. The cubic root of 400545772 is about 737.1412543067.

The spelling of 400545772 in words is "four hundred million, five hundred forty-five thousand, seven hundred seventy-two".