400845672 has 40 divisors (see below), whose sum is σ = 1122740850. Its totient is φ = 133615008.

The previous prime is 400845667. The next prime is 400845689. The reversal of 400845672 is 276548004.

It can be written as a sum of positive squares in only one way, i.e., 373030596 + 27815076 = 19314^2 + 5274^2 .

It is a super-2 number, since 2×400845672² = 321354505522263168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 308647 + ... + 309942.

Almost surely, 2^400845672 is an apocalyptic number.

It is an amenable number.

400845672 is an abundant number, since it is smaller than the sum of its proper divisors (721895178).

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

400845672 is a wasteful number, since it uses less digits than its factorization.

400845672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618607 (or 618594 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 400845672 is about 20021.1306374041. The cubic root of 400845672 is about 737.3251812776.

The spelling of 400845672 in words is "four hundred million, eight hundred forty-five thousand, six hundred seventy-two".