394995988 has 6 divisors (see below), whose sum is σ = 691242986. Its totient is φ = 197497992.

The previous prime is 394995977. The next prime is 394996001. The reversal of 394995988 is 889599493.

It can be written as a sum of positive squares in only one way, i.e., 247810564 + 147185424 = 15742^2 + 12132^2 .

It is a super-2 number, since 2×394995988² = 312043661072192288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49374495 + ... + 49374502.

Almost surely, 2^394995988 is an apocalyptic number.

It is an amenable number.

394995988 is a deficient number, since it is larger than the sum of its proper divisors (296246998).

394995988 is a wasteful number, since it uses less digits than its factorization.

394995988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98749001 (or 98748999 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 64.

The square root of 394995988 is about 19874.5059812816. The cubic root of 394995988 is about 733.7209079823.

The spelling of 394995988 in words is "three hundred ninety-four million, nine hundred ninety-five thousand, nine hundred eighty-eight".