395978649 has 32 divisors (see below), whose sum is σ = 605021184. Its totient is φ = 228022080.

The previous prime is 395978623. The next prime is 395978657. The reversal of 395978649 is 946879593.

It is not a de Polignac number, because 395978649 - 2⁷ = 395978521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 395978592 and 395978601.

It is not an unprimeable number, because it can be changed into a prime (395978549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117502 + ... + 120824.

It is an arithmetic number, because the mean of its divisors is an integer number (18906912).

Almost surely, 2^395978649 is an apocalyptic number.

It is an amenable number.

395978649 is a deficient number, since it is larger than the sum of its proper divisors (209042535).

395978649 is a wasteful number, since it uses less digits than its factorization.

395978649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517.

The product of its digits is 14696640, while the sum is 60.

The square root of 395978649 is about 19899.2122708413. The cubic root of 395978649 is about 734.3288482094.

The spelling of 395978649 in words is "three hundred ninety-five million, nine hundred seventy-eight thousand, six hundred forty-nine".