394759949 has 2 divisors, whose sum is σ = 394759950. Its totient is φ = 394759948.

The previous prime is 394759943. The next prime is 394759951. The reversal of 394759949 is 949957493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 337273225 + 57486724 = 18365^2 + 7582^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394759949 is a prime.

Together with 394759951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394759943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197379974 + 197379975.

It is an arithmetic number, because the mean of its divisors is an integer number (197379975).

Almost surely, 2^394759949 is an apocalyptic number.

It is an amenable number.

394759949 is a deficient number, since it is larger than the sum of its proper divisors (1).

394759949 is an equidigital number, since it uses as much as digits as its factorization.

394759949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 59.

The square root of 394759949 is about 19868.5668582311. The cubic root of 394759949 is about 733.5747282207.

The spelling of 394759949 in words is "three hundred ninety-four million, seven hundred fifty-nine thousand, nine hundred forty-nine".