394978573 has 4 divisors (see below), whose sum is σ = 430885728. Its totient is φ = 359071420.

The previous prime is 394978537. The next prime is 394978603. The reversal of 394978573 is 375879493.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 375879493 = 11 ⋅34170863.

It is a cyclic number.

It is not a de Polignac number, because 394978573 - 2¹⁷ = 394847501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394978523) 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, 17953561 + ... + 17953582.

It is an arithmetic number, because the mean of its divisors is an integer number (107721432).

Almost surely, 2^394978573 is an apocalyptic number.

It is an amenable number.

394978573 is a deficient number, since it is larger than the sum of its proper divisors (35907155).

394978573 is a wasteful number, since it uses less digits than its factorization.

394978573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35907154.

The product of its digits is 5715360, while the sum is 55.

The square root of 394978573 is about 19874.0678523547. The cubic root of 394978573 is about 733.7101248033.

The spelling of 394978573 in words is "three hundred ninety-four million, nine hundred seventy-eight thousand, five hundred seventy-three".