397091394 has 36 divisors (see below), whose sum is σ = 1000834614. Its totient is φ = 113454432.

The previous prime is 397091381. The next prime is 397091399. The reversal of 397091394 is 493190793.

It can be written as a sum of positive squares in only one way, i.e., 280127169 + 116964225 = 16737^2 + 10815^2 .

It is not an unprimeable number, because it can be changed into a prime (397091399) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 224227 + ... + 225990.

Almost surely, 2^397091394 is an apocalyptic number.

397091394 is an abundant number, since it is smaller than the sum of its proper divisors (603743220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397091394 is a wasteful number, since it uses less digits than its factorization.

397091394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450239 (or 450229 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 397091394 is about 19927.1521798776. The cubic root of 397091394 is about 735.0160540711.

The spelling of 397091394 in words is "three hundred ninety-seven million, ninety-one thousand, three hundred ninety-four".