401626665 has 48 divisors (see below), whose sum is σ = 777142080. Its totient is φ = 190189440.

The previous prime is 401626619. The next prime is 401626691. The reversal of 401626665 is 566626104.

It is a happy number.

It is not a de Polignac number, because 401626665 - 2⁸ = 401626409 is a prime.

It is a super-2 number, since 2×401626665² = 322607956078044450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11851 + ... + 30719.

It is an arithmetic number, because the mean of its divisors is an integer number (16190460).

Almost surely, 2^401626665 is an apocalyptic number.

401626665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

401626665 is a deficient number, since it is larger than the sum of its proper divisors (375515415).

401626665 is a wasteful number, since it uses less digits than its factorization.

401626665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18934 (or 18931 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 401626665 is about 20040.6253644940. The cubic root of 401626665 is about 737.8037297267.

The spelling of 401626665 in words is "four hundred one million, six hundred twenty-six thousand, six hundred sixty-five".