397205172 has 108 divisors (see below), whose sum is σ = 1257888996. Its totient is φ = 104751360.

The previous prime is 397205167. The next prime is 397205173. The reversal of 397205172 is 271502793.

It can be written as a sum of positive squares in 2 ways, for example, as 83064996 + 314140176 = 9114^2 + 17724^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397205173) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14272 + ... + 31592.

Almost surely, 2^397205172 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 397205172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (628944498).

397205172 is an abundant number, since it is smaller than the sum of its proper divisors (860683824).

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

397205172 is a wasteful number, since it uses less digits than its factorization.

397205172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17358 (or 17346 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 397205172 is about 19930.0068238824. The cubic root of 397205172 is about 735.0862483822.

The spelling of 397205172 in words is "three hundred ninety-seven million, two hundred five thousand, one hundred seventy-two".