400720113 has 12 divisors (see below), whose sum is σ = 579041268. Its totient is φ = 267043680.

The previous prime is 400720109. The next prime is 400720129. The reversal of 400720113 is 311027004.

It can be written as a sum of positive squares in 2 ways, for example, as 100460529 + 300259584 = 10023^2 + 17328^2 .

It is not a de Polignac number, because 400720113 - 2² = 400720109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400720193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21631 + ... + 35627.

It is an arithmetic number, because the mean of its divisors is an integer number (48253439).

Almost surely, 2^400720113 is an apocalyptic number.

It is an amenable number.

400720113 is a deficient number, since it is larger than the sum of its proper divisors (178321155).

400720113 is a wasteful number, since it uses less digits than its factorization.

400720113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17184 (or 17181 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 400720113 is about 20017.9947297425. The cubic root of 400720113 is about 737.2481878220.

Adding to 400720113 its reverse (311027004), we get a palindrome (711747117).

The spelling of 400720113 in words is "four hundred million, seven hundred twenty thousand, one hundred thirteen".