397530812 has 48 divisors (see below), whose sum is σ = 820216320. Its totient is φ = 165022272.

The previous prime is 397530797. The next prime is 397530817. The reversal of 397530812 is 218035793.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397530817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271739 + ... + 273197.

It is an arithmetic number, because the mean of its divisors is an integer number (17087840).

Almost surely, 2^397530812 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 397530812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (410108160).

397530812 is an abundant number, since it is smaller than the sum of its proper divisors (422685508).

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

397530812 is a wasteful number, since it uses less digits than its factorization.

397530812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770 (or 1768 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 397530812 is about 19938.1747409335. The cubic root of 397530812 is about 735.2870749890.

The spelling of 397530812 in words is "three hundred ninety-seven million, five hundred thirty thousand, eight hundred twelve".