400316720 has 20 divisors (see below), whose sum is σ = 930736560. Its totient is φ = 160126656.

The previous prime is 400316717. The next prime is 400316723. The reversal of 400316720 is 27613004.

It is an interprime number because it is at equal distance from previous prime (400316717) and next prime (400316723).

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (400316723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2501900 + ... + 2502059.

It is an arithmetic number, because the mean of its divisors is an integer number (46536828).

Almost surely, 2^400316720 is an apocalyptic number.

400316720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400316720 is an abundant number, since it is smaller than the sum of its proper divisors (530419840).

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

400316720 is a wasteful number, since it uses less digits than its factorization.

400316720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5003972 (or 5003966 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 400316720 is about 20007.9164332521. The cubic root of 400316720 is about 737.0007161668. Note that the first 3 decimals are identical.

Adding to 400316720 its reverse (27613004), we get a palindrome (427929724).

The spelling of 400316720 in words is "four hundred million, three hundred sixteen thousand, seven hundred twenty".