395172985 has 8 divisors (see below), whose sum is σ = 475481160. Its totient is φ = 315289344.

The previous prime is 395172983. The next prime is 395172989. The reversal of 395172985 is 589271593.

It can be written as a sum of positive squares in 4 ways, for example, as 163737616 + 231435369 = 12796^2 + 15213^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 395172985 - 2¹ = 395172983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (395172983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104080 + ... + 107809.

It is an arithmetic number, because the mean of its divisors is an integer number (59435145).

Almost surely, 2^395172985 is an apocalyptic number.

It is an amenable number.

395172985 is a deficient number, since it is larger than the sum of its proper divisors (80308175).

395172985 is a wasteful number, since it uses less digits than its factorization.

395172985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212267.

The product of its digits is 680400, while the sum is 49.

The square root of 395172985 is about 19878.9583479618. The cubic root of 395172985 is about 733.8304846284.

The spelling of 395172985 in words is "three hundred ninety-five million, one hundred seventy-two thousand, nine hundred eighty-five".