401645905 has 16 divisors (see below), whose sum is σ = 490089600. Its totient is φ = 315925632.

The previous prime is 401645891. The next prime is 401645917. The reversal of 401645905 is 509546104.

It is a cyclic number.

It is not a de Polignac number, because 401645905 - 2⁵ = 401645873 is a prime.

It is a super-2 number, since 2×401645905² = 322638866006538050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286396 + ... + 287794.

It is an arithmetic number, because the mean of its divisors is an integer number (30630600).

Almost surely, 2^401645905 is an apocalyptic number.

It is an amenable number.

401645905 is a deficient number, since it is larger than the sum of its proper divisors (88443695).

401645905 is a wasteful number, since it uses less digits than its factorization.

401645905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 401645905 is about 20041.1053836858. The cubic root of 401645905 is about 737.8155110802.

The spelling of 401645905 in words is "four hundred one million, six hundred forty-five thousand, nine hundred five".