397555164 has 72 divisors (see below), whose sum is σ = 1061424000. Its totient is φ = 125116704.

The previous prime is 397555159. The next prime is 397555181. The reversal of 397555164 is 461555793.

397555164 is a `hidden beast` number, since 3 + 97 + 5 + 551 + 6 + 4 = 666.

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 23 ways as a sum of consecutive naturals, for example, 244747 + ... + 246365.

It is an arithmetic number, because the mean of its divisors is an integer number (14742000).

Almost surely, 2^397555164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397555164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (530712000).

397555164 is an abundant number, since it is smaller than the sum of its proper divisors (663868836).

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

397555164 is a wasteful number, since it uses less digits than its factorization.

397555164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007 (or 2002 counting only the distinct ones).

The product of its digits is 567000, while the sum is 45.

The square root of 397555164 is about 19938.7854193780. The cubic root of 397555164 is about 735.3020887898.

The spelling of 397555164 in words is "three hundred ninety-seven million, five hundred fifty-five thousand, one hundred sixty-four".