395401899978 has 40 divisors (see below), whose sum is σ = 886077830880. Its totient is φ = 131788035720.

The previous prime is 395401899967. The next prime is 395401899983. The reversal of 395401899978 is 879998104593.

395401899978 is a `hidden beast` number, since 3 + 9 + 540 + 1 + 8 + 9 + 9 + 9 + 78 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1667443 + ... + 1889753.

It is an arithmetic number, because the mean of its divisors is an integer number (22151945772).

Almost surely, 2^395401899978 is an apocalyptic number.

395401899978 is an abundant number, since it is smaller than the sum of its proper divisors (490675930902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

395401899978 is a wasteful number, since it uses less digits than its factorization.

395401899978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233304 (or 233295 counting only the distinct ones).

The product of its (nonzero) digits is 176359680, while the sum is 72.

The spelling of 395401899978 in words is "three hundred ninety-five billion, four hundred one million, eight hundred ninety-nine thousand, nine hundred seventy-eight".