397397220 has 192 divisors, whose sum is σ = 1295917056. Its totient is φ = 90027520.

The previous prime is 397397207. The next prime is 397397227. The reversal of 397397220 is 22793793.

It is not an unprimeable number, because it can be changed into a prime (397397227) 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, 713182 + ... + 713738.

It is an arithmetic number, because the mean of its divisors is an integer number (6749568).

Almost surely, 2^397397220 is an apocalyptic number.

397397220 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 397397220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (647958528).

397397220 is an abundant number, since it is smaller than the sum of its proper divisors (898519836).

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

397397220 is a wasteful number, since it uses less digits than its factorization.

397397220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 648 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 42.

The square root of 397397220 is about 19934.8243032137. The cubic root of 397397220 is about 735.2047002620.

The spelling of 397397220 in words is "three hundred ninety-seven million, three hundred ninety-seven thousand, two hundred twenty".