394861945 has 4 divisors (see below), whose sum is σ = 473834340. Its totient is φ = 315889552.

The previous prime is 394861931. The next prime is 394861963. The reversal of 394861945 is 549168493.

It is a happy number.

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 95883264 + 298978681 = 9792^2 + 17291^2 .

It is a cyclic number.

It is not a de Polignac number, because 394861945 - 2⁵ = 394861913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39486190 + ... + 39486199.

It is an arithmetic number, because the mean of its divisors is an integer number (118458585).

Almost surely, 2^394861945 is an apocalyptic number.

It is an amenable number.

394861945 is a deficient number, since it is larger than the sum of its proper divisors (78972395).

394861945 is an equidigital number, since it uses as much as digits as its factorization.

394861945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78972394.

The product of its digits is 933120, while the sum is 49.

The square root of 394861945 is about 19871.1334603741. The cubic root of 394861945 is about 733.6379018406.

The spelling of 394861945 in words is "three hundred ninety-four million, eight hundred sixty-one thousand, nine hundred forty-five".