394722970 has 16 divisors (see below), whose sum is σ = 713554920. Its totient is φ = 157210624.

The previous prime is 394722961. The next prime is 394722971. The reversal of 394722970 is 79227493.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 314459289 + 80263681 = 17733^2 + 8959^2 .

It is not an unprimeable number, because it can be changed into a prime (394722971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82375 + ... + 87034.

Almost surely, 2^394722970 is an apocalyptic number.

394722970 is a deficient number, since it is larger than the sum of its proper divisors (318831950).

394722970 is a wasteful number, since it uses less digits than its factorization.

394722970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169649.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 394722970 is about 19867.6362459151. The cubic root of 394722970 is about 733.5518217202.

The spelling of 394722970 in words is "three hundred ninety-four million, seven hundred twenty-two thousand, nine hundred seventy".