397980 has 96 divisors (see below), whose sum is σ = 1370880. Its totient is φ = 95040.

The previous prime is 397973. The next prime is 397981. The reversal of 397980 is 89793.

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 (397981) by changing a digit.

397980 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5907 + ... + 5973.

It is an arithmetic number, because the mean of its divisors is an integer number (14280).

2³⁹⁷⁹⁸⁰ is an apocalyptic number.

397980 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 397980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685440).

397980 is an abundant number, since it is smaller than the sum of its proper divisors (972900).

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

397980 is a wasteful number, since it uses less digits than its factorization.

397980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 397980 is about 630.8565605587. The cubic root of 397980 is about 73.5563915424.

The spelling of 397980 in words is "three hundred ninety-seven thousand, nine hundred eighty".