395915681 has 16 divisors (see below), whose sum is σ = 461220480. Its totient is φ = 332830080.

The previous prime is 395915647. The next prime is 395915713. The reversal of 395915681 is 186519593.

It is a cyclic number.

It is not a de Polignac number, because 395915681 - 2⁶ = 395915617 is a prime.

It is a super-2 number, since 2×395915681² = 313498452923387522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (395915621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173510 + ... + 175776.

It is an arithmetic number, because the mean of its divisors is an integer number (28826280).

Almost surely, 2^395915681 is an apocalyptic number.

It is an amenable number.

395915681 is a deficient number, since it is larger than the sum of its proper divisors (65304799).

395915681 is a wasteful number, since it uses less digits than its factorization.

395915681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744.

The product of its digits is 291600, while the sum is 47.

The square root of 395915681 is about 19897.6300347554. The cubic root of 395915681 is about 734.2899221459.

The spelling of 395915681 in words is "three hundred ninety-five million, nine hundred fifteen thousand, six hundred eighty-one".