400116665 has 8 divisors (see below), whose sum is σ = 517073928. Its totient is φ = 295470720.

The previous prime is 400116623. The next prime is 400116667. The reversal of 400116665 is 566611004.

It can be written as a sum of positive squares in 4 ways, for example, as 27008809 + 373107856 = 5197^2 + 19316^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400116665 - 2⁶ = 400116601 is a prime.

It is a super-2 number, since 2×400116665² = 320186691221444450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400116667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3077756 + ... + 3077885.

It is an arithmetic number, because the mean of its divisors is an integer number (64634241).

Almost surely, 2^400116665 is an apocalyptic number.

It is an amenable number.

400116665 is a deficient number, since it is larger than the sum of its proper divisors (116957263).

400116665 is a wasteful number, since it uses less digits than its factorization.

400116665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6155659.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 400116665 is about 20002.9164123635. The cubic root of 400116665 is about 736.8779256875.

Adding to 400116665 its reverse (566611004), we get a palindrome (966727669).

The spelling of 400116665 in words is "four hundred million, one hundred sixteen thousand, six hundred sixty-five".