400565016 has 96 divisors (see below), whose sum is σ = 1164674160. Its totient is φ = 123918336.

The previous prime is 400564993. The next prime is 400565017. The reversal of 400565016 is 610565004.

It is a happy number.

400565016 is a `hidden beast` number, since 4 + 0 + 0 + 5 + 650 + 1 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400565017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87111 + ... + 91593.

Almost surely, 2^400565016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400565016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (582337080).

400565016 is an abundant number, since it is smaller than the sum of its proper divisors (764109144).

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

400565016 is a wasteful number, since it uses less digits than its factorization.

400565016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4585 (or 4578 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 400565016 is about 20014.1204153468. The cubic root of 400565016 is about 737.1530592989.

The spelling of 400565016 in words is "four hundred million, five hundred sixty-five thousand, sixteen".