394627661 has 2 divisors, whose sum is σ = 394627662. Its totient is φ = 394627660.

The previous prime is 394627657. The next prime is 394627729. The reversal of 394627661 is 166726493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251825161 + 142802500 = 15869^2 + 11950^2 .

It is a cyclic number.

It is not a de Polignac number, because 394627661 - 2² = 394627657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394627601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197313830 + 197313831.

It is an arithmetic number, because the mean of its divisors is an integer number (197313831).

Almost surely, 2^394627661 is an apocalyptic number.

It is an amenable number.

394627661 is a deficient number, since it is larger than the sum of its proper divisors (1).

394627661 is an equidigital number, since it uses as much as digits as its factorization.

394627661 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 394627661 is about 19865.2375017265. The cubic root of 394627661 is about 733.4927763274.

The spelling of 394627661 in words is "three hundred ninety-four million, six hundred twenty-seven thousand, six hundred sixty-one".