395909891 has 4 divisors (see below), whose sum is σ = 426364512. Its totient is φ = 365455272.

The previous prime is 395909887. The next prime is 395909893. The reversal of 395909891 is 198909593.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 395909891 - 2² = 395909887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (395909893) 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, 15227291 + ... + 15227316.

It is an arithmetic number, because the mean of its divisors is an integer number (106591128).

Almost surely, 2^395909891 is an apocalyptic number.

395909891 is a deficient number, since it is larger than the sum of its proper divisors (30454621).

395909891 is a wasteful number, since it uses less digits than its factorization.

395909891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30454620.

The product of its (nonzero) digits is 787320, while the sum is 53.

The square root of 395909891 is about 19897.4845395090. The cubic root of 395909891 is about 734.2863426300.

The spelling of 395909891 in words is "three hundred ninety-five million, nine hundred nine thousand, eight hundred ninety-one".