400716720 has 140 divisors (see below), whose sum is σ = 1397063856. Its totient is φ = 106842240.

The previous prime is 400716709. The next prime is 400716727. The reversal of 400716720 is 27617004.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (400716727) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 54885 + ... + 61755.

Almost surely, 2^400716720 is an apocalyptic number.

400716720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400716720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (698531928).

400716720 is an abundant number, since it is smaller than the sum of its proper divisors (996347136).

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

400716720 is an equidigital number, since it uses as much as digits as its factorization.

400716720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6902 (or 6881 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 400716720 is about 20017.9099808147. The cubic root of 400716720 is about 737.2461069930.

The spelling of 400716720 in words is "four hundred million, seven hundred sixteen thousand, seven hundred twenty".