394749647 has 2 divisors, whose sum is σ = 394749648. Its totient is φ = 394749646.

The previous prime is 394749631. The next prime is 394749683. The reversal of 394749647 is 746947493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394749647 - 2⁴ = 394749631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394749697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197374823 + 197374824.

It is an arithmetic number, because the mean of its divisors is an integer number (197374824).

Almost surely, 2^394749647 is an apocalyptic number.

394749647 is a deficient number, since it is larger than the sum of its proper divisors (1).

394749647 is an equidigital number, since it uses as much as digits as its factorization.

394749647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 53.

The square root of 394749647 is about 19868.3076028131. The cubic root of 394749647 is about 733.5683468298.

The spelling of 394749647 in words is "three hundred ninety-four million, seven hundred forty-nine thousand, six hundred forty-seven".