395930748978 has 66 divisors (see below), whose sum is σ = 891325953567. Its totient is φ = 131904837180.

The previous prime is 395930748971. The next prime is 395930749051. The reversal of 395930748978 is 879847039593.

395930748978 is a `hidden beast` number, since 395 + 93 + 0 + 7 + 4 + 89 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 197965374489 + 197965374489 = 444933^2 + 444933^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=444933.

It is a super-2 number, since 2×395930748978² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (395930748971) by changing a digit.

It is a polite number, since it can be written in 32 ways as a sum of consecutive naturals, for example, 216236523 + ... + 216238353.

Almost surely, 2^395930748978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 395930748978

395930748978 is an abundant number, since it is smaller than the sum of its proper divisors (495395204589).

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

395930748978 is an frugal number, since it uses more digits than its factorization.

395930748978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694 (or 1836 counting only the distinct ones).

The product of its (nonzero) digits is 411505920, while the sum is 72.

Multiplying 395930748978 by its sum of digits (72), we get a square (28507013926416 = 5339196²).

The spelling of 395930748978 in words is "three hundred ninety-five billion, nine hundred thirty million, seven hundred forty-eight thousand, nine hundred seventy-eight".