394991925 has 24 divisors (see below), whose sum is σ = 674123520. Its totient is φ = 203865600.

The previous prime is 394991921. The next prime is 394991929. The reversal of 394991925 is 529199493.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (394991921) and next prime (394991929).

It is not a de Polignac number, because 394991925 - 2² = 394991921 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394991921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82620 + ... + 87269.

It is an arithmetic number, because the mean of its divisors is an integer number (28088480).

Almost surely, 2^394991925 is an apocalyptic number.

It is an amenable number.

394991925 is a deficient number, since it is larger than the sum of its proper divisors (279131595).

394991925 is a wasteful number, since it uses less digits than its factorization.

394991925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169933 (or 169928 counting only the distinct ones).

The product of its digits is 787320, while the sum is 51.

The square root of 394991925 is about 19874.4037646416. The cubic root of 394991925 is about 733.7183922452.

The spelling of 394991925 in words is "three hundred ninety-four million, nine hundred ninety-one thousand, nine hundred twenty-five".