397291158 has 72 divisors (see below), whose sum is σ = 958557600. Its totient is φ = 118815840.

The previous prime is 397291099. The next prime is 397291171. The reversal of 397291158 is 851192793.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 170908 + ... + 173216.

It is an arithmetic number, because the mean of its divisors is an integer number (13313300).

Almost surely, 2^397291158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397291158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (479278800).

397291158 is an abundant number, since it is smaller than the sum of its proper divisors (561266442).

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

397291158 is a wasteful number, since it uses less digits than its factorization.

397291158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2418 (or 2404 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 397291158 is about 19932.1639066108. The cubic root of 397291158 is about 735.1392877769.

The spelling of 397291158 in words is "three hundred ninety-seven million, two hundred ninety-one thousand, one hundred fifty-eight".