395401206978 has 12 divisors (see below), whose sum is σ = 856702615158. Its totient is φ = 131800402320.

The previous prime is 395401206971. The next prime is 395401206983. The reversal of 395401206978 is 879602104593.

395401206978 is a `hidden beast` number, since 3 + 9 + 540 + 1 + 2 + 0 + 6 + 97 + 8 = 666.

395401206978 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 358062214689 + 37338992289 = 598383^2 + 193233^2 .

It is a super-2 number, since 2×395401206978² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (395401206971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10983366843 + ... + 10983366878.

It is a 2-persistent number, because it is pandigital, and so is 2⋅395401206978 = 790802413956, but 3⋅395401206978 = 1186203620934 is not.

Almost surely, 2^395401206978 is an apocalyptic number.

395401206978 is an abundant number, since it is smaller than the sum of its proper divisors (461301408180).

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

395401206978 is a wasteful number, since it uses less digits than its factorization.

395401206978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21966733729 (or 21966733726 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 395401206978 in words is "three hundred ninety-five billion, four hundred one million, two hundred six thousand, nine hundred seventy-eight".