397730181 has 24 divisors (see below), whose sum is σ = 565675744. Its totient is φ = 248520960.

The previous prime is 397730171. The next prime is 397730189. The reversal of 397730181 is 181037793.

It is a happy number.

It is not a de Polignac number, because 397730181 - 2¹⁵ = 397697413 is a prime.

It is a super-2 number, since 2×397730181² = 316378593756585522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397730189) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 244551 + ... + 246171.

Almost surely, 2^397730181 is an apocalyptic number.

It is an amenable number.

397730181 is a deficient number, since it is larger than the sum of its proper divisors (167945563).

397730181 is a wasteful number, since it uses less digits than its factorization.

397730181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941 (or 1924 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 397730181 is about 19943.1737945594. The cubic root of 397730181 is about 735.4099744346.

The spelling of 397730181 in words is "three hundred ninety-seven million, seven hundred thirty thousand, one hundred eighty-one".