394813637 has 2 divisors, whose sum is σ = 394813638. Its totient is φ = 394813636.

The previous prime is 394813621. The next prime is 394813669. The reversal of 394813637 is 736318493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 275261281 + 119552356 = 16591^2 + 10934^2 .

It is a cyclic number.

It is not a de Polignac number, because 394813637 - 2⁴ = 394813621 is a prime.

It is a super-2 number, since 2×394813637² = 311755615922335538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394812637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197406818 + 197406819.

It is an arithmetic number, because the mean of its divisors is an integer number (197406819).

Almost surely, 2^394813637 is an apocalyptic number.

It is an amenable number.

394813637 is a deficient number, since it is larger than the sum of its proper divisors (1).

394813637 is an equidigital number, since it uses as much as digits as its factorization.

394813637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 44.

The square root of 394813637 is about 19869.9178911238. The cubic root of 394813637 is about 733.6079825016.

The spelling of 394813637 in words is "three hundred ninety-four million, eight hundred thirteen thousand, six hundred thirty-seven".