395689981785 has 128 divisors (see below), whose sum is σ = 773834342400. Its totient is φ = 168629610240.

The previous prime is 395689981783. The next prime is 395689981807. The reversal of 395689981785 is 587189986593.

It is not a de Polignac number, because 395689981785 - 2¹ = 395689981783 is a prime.

It is a Smith number, since the sum of its digits (78) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 395689981785.

It is not an unprimeable number, because it can be changed into a prime (395689981781) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 83143236 + ... + 83147994.

It is an arithmetic number, because the mean of its divisors is an integer number (6045580800).

Almost surely, 2^395689981785 is an apocalyptic number.

395689981785 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

395689981785 is a deficient number, since it is larger than the sum of its proper divisors (378144360615).

395689981785 is a wasteful number, since it uses less digits than its factorization.

395689981785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5451.

The product of its digits is 1175731200, while the sum is 78.

The spelling of 395689981785 in words is "three hundred ninety-five billion, six hundred eighty-nine million, nine hundred eighty-one thousand, seven hundred eighty-five".