400720117 has 4 divisors (see below), whose sum is σ = 457965856. Its totient is φ = 343474380.

The previous prime is 400720109. The next prime is 400720129. The reversal of 400720117 is 711027004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400720117 - 2³ = 400720109 is a prime.

It is a super-2 number, since 2×400720117² = 321153224336987378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400720147) 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, 28622859 + ... + 28622872.

It is an arithmetic number, because the mean of its divisors is an integer number (114491464).

Almost surely, 2^400720117 is an apocalyptic number.

It is an amenable number.

400720117 is a deficient number, since it is larger than the sum of its proper divisors (57245739).

400720117 is an equidigital number, since it uses as much as digits as its factorization.

400720117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57245738.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 400720117 is about 20017.9948296526. The cubic root of 400720117 is about 737.2481902751.

The spelling of 400720117 in words is "four hundred million, seven hundred twenty thousand, one hundred seventeen".