394122657 has 4 divisors (see below), whose sum is σ = 525496880. Its totient is φ = 262748436.

The previous prime is 394122653. The next prime is 394122689. The reversal of 394122657 is 756221493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 394122657 - 2² = 394122653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394122653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65687107 + ... + 65687112.

It is an arithmetic number, because the mean of its divisors is an integer number (131374220).

Almost surely, 2^394122657 is an apocalyptic number.

It is an amenable number.

394122657 is a deficient number, since it is larger than the sum of its proper divisors (131374223).

394122657 is a wasteful number, since it uses less digits than its factorization.

394122657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131374222.

The product of its digits is 90720, while the sum is 39.

The square root of 394122657 is about 19852.5226860467. The cubic root of 394122657 is about 733.1797598292.

The spelling of 394122657 in words is "three hundred ninety-four million, one hundred twenty-two thousand, six hundred fifty-seven".