394635961 has 2 divisors, whose sum is σ = 394635962. Its totient is φ = 394635960.

The previous prime is 394635959. The next prime is 394636003. The reversal of 394635961 is 169536493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373069225 + 21566736 = 19315^2 + 4644^2 .

It is a cyclic number.

It is not a de Polignac number, because 394635961 - 2¹ = 394635959 is a prime.

Together with 394635959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (394635911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197317980 + 197317981.

It is an arithmetic number, because the mean of its divisors is an integer number (197317981).

Almost surely, 2^394635961 is an apocalyptic number.

It is an amenable number.

394635961 is a deficient number, since it is larger than the sum of its proper divisors (1).

394635961 is an equidigital number, since it uses as much as digits as its factorization.

394635961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 46.

The square root of 394635961 is about 19865.4464082738. The cubic root of 394635961 is about 733.4979186830.

The spelling of 394635961 in words is "three hundred ninety-four million, six hundred thirty-five thousand, nine hundred sixty-one".