394974721 has 4 divisors (see below), whose sum is σ = 395379972. Its totient is φ = 394569472.

The previous prime is 394974703. The next prime is 394974731. The reversal of 394974721 is 127479493.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 206324496 + 188650225 = 14364^2 + 13735^2 .

It is a cyclic number.

It is not a de Polignac number, because 394974721 - 2¹³ = 394966529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394974731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201160 + ... + 203113.

It is an arithmetic number, because the mean of its divisors is an integer number (98844993).

Almost surely, 2^394974721 is an apocalyptic number.

It is an amenable number.

394974721 is a deficient number, since it is larger than the sum of its proper divisors (405251).

394974721 is an equidigital number, since it uses as much as digits as its factorization.

394974721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405250.

The product of its digits is 381024, while the sum is 46.

The square root of 394974721 is about 19873.9709419129. The cubic root of 394974721 is about 733.7077396438.

The spelling of 394974721 in words is "three hundred ninety-four million, nine hundred seventy-four thousand, seven hundred twenty-one".