394995987 has 8 divisors (see below), whose sum is σ = 585179280. Its totient is φ = 263330640.

The previous prime is 394995977. The next prime is 394996001. The reversal of 394995987 is 789599493.

It is a happy number.

394995987 is a `hidden beast` number, since 39 + 4 + 9 + 9 + 598 + 7 = 666.

It is not a de Polignac number, because 394995987 - 2²⁸ = 126560531 is a prime.

It is a super-2 number, since 2×394995987² = 312043659492208338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394995947) 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, 7314714 + ... + 7314767.

It is an arithmetic number, because the mean of its divisors is an integer number (73147410).

Almost surely, 2^394995987 is an apocalyptic number.

394995987 is a deficient number, since it is larger than the sum of its proper divisors (190183293).

394995987 is a wasteful number, since it uses less digits than its factorization.

394995987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14629490 (or 14629484 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 63.

The square root of 394995987 is about 19874.5059561238. The cubic root of 394995987 is about 733.7209073631.

The spelling of 394995987 in words is "three hundred ninety-four million, nine hundred ninety-five thousand, nine hundred eighty-seven".