397689394 has 8 divisors (see below), whose sum is σ = 612656748. Its totient is φ = 193470480.

The previous prime is 397689373. The next prime is 397689403. The reversal of 397689394 is 493986793.

It can be written as a sum of positive squares in 2 ways, for example, as 394538769 + 3150625 = 19863^2 + 1775^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 2687017 + ... + 2687164.

Almost surely, 2^397689394 is an apocalyptic number.

397689394 is a deficient number, since it is larger than the sum of its proper divisors (214967354).

397689394 is a wasteful number, since it uses less digits than its factorization.

397689394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5374220.

The product of its digits is 8817984, while the sum is 58.

The square root of 397689394 is about 19942.1511878734. The cubic root of 397689394 is about 735.3848349527.

The spelling of 397689394 in words is "three hundred ninety-seven million, six hundred eighty-nine thousand, three hundred ninety-four".