394490057 has 4 divisors (see below), whose sum is σ = 424835460. Its totient is φ = 364144656.

The previous prime is 394490017. The next prime is 394490059. The reversal of 394490057 is 750094493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750094493 = 79 ⋅9494867.

It can be written as a sum of positive squares in 2 ways, for example, as 134119561 + 260370496 = 11581^2 + 16136^2 .

It is a cyclic number.

It is not a de Polignac number, because 394490057 - 2⁸ = 394489801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 394489996 and 394490023.

It is not an unprimeable number, because it can be changed into a prime (394490059) 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, 15172682 + ... + 15172707.

It is an arithmetic number, because the mean of its divisors is an integer number (106208865).

Almost surely, 2^394490057 is an apocalyptic number.

It is an amenable number.

394490057 is a deficient number, since it is larger than the sum of its proper divisors (30345403).

394490057 is a wasteful number, since it uses less digits than its factorization.

394490057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30345402.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 394490057 is about 19861.7737626829. The cubic root of 394490057 is about 733.4075117572.

The spelling of 394490057 in words is "three hundred ninety-four million, four hundred ninety thousand, fifty-seven".