394908513 has 16 divisors (see below), whose sum is σ = 530456256. Its totient is φ = 261324800.

The previous prime is 394908509. The next prime is 394908541. The reversal of 394908513 is 315809493.

It is a cyclic number.

It is not a de Polignac number, because 394908513 - 2² = 394908509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (394908583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271438 + ... + 272888.

It is an arithmetic number, because the mean of its divisors is an integer number (33153516).

Almost surely, 2^394908513 is an apocalyptic number.

It is an amenable number.

394908513 is a deficient number, since it is larger than the sum of its proper divisors (135547743).

394908513 is a wasteful number, since it uses less digits than its factorization.

394908513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 394908513 is about 19872.3051757968. The cubic root of 394908513 is about 733.6667412086. Note that the first 3 decimals are identical.

The spelling of 394908513 in words is "three hundred ninety-four million, nine hundred eight thousand, five hundred thirteen".