397889073 has 12 divisors (see below), whose sum is σ = 585573300. Its totient is φ = 260254176.

The previous prime is 397889071. The next prime is 397889087. The reversal of 397889073 is 370988793.

It can be written as a sum of positive squares in 2 ways, for example, as 313396209 + 84492864 = 17703^2 + 9192^2 .

It is not a de Polignac number, because 397889073 - 2¹ = 397889071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397889071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 416598 + ... + 417551.

It is an arithmetic number, because the mean of its divisors is an integer number (48797775).

Almost surely, 2^397889073 is an apocalyptic number.

It is an amenable number.

397889073 is a deficient number, since it is larger than the sum of its proper divisors (187684227).

397889073 is a wasteful number, since it uses less digits than its factorization.

397889073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834208 (or 834205 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The square root of 397889073 is about 19947.1570154747. The cubic root of 397889073 is about 735.5078927472.

The spelling of 397889073 in words is "three hundred ninety-seven million, eight hundred eighty-nine thousand, seventy-three".