397202520 has 256 divisors, whose sum is σ = 1422489600. Its totient is φ = 87459840.

The previous prime is 397202513. The next prime is 397202521. The reversal of 397202520 is 25202793.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397202521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1355494 + ... + 1355786.

It is an arithmetic number, because the mean of its divisors is an integer number (5556600).

Almost surely, 2^397202520 is an apocalyptic number.

397202520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397202520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (711244800).

397202520 is an abundant number, since it is smaller than the sum of its proper divisors (1025287080).

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

397202520 is a wasteful number, since it uses less digits than its factorization.

397202520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 397202520 is about 19929.9402909291. The cubic root of 397202520 is about 735.0846124073.

The spelling of 397202520 in words is "three hundred ninety-seven million, two hundred two thousand, five hundred twenty".