397780 has 12 divisors (see below), whose sum is σ = 835380. Its totient is φ = 159104.

The previous prime is 397763. The next prime is 397799. The reversal of 397780 is 87793.

It can be written as a sum of positive squares in 2 ways, for example, as 276676 + 121104 = 526^2 + 348^2 .

It is a zygodrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9925 + ... + 9964.

It is an arithmetic number, because the mean of its divisors is an integer number (69615).

2³⁹⁷⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

397780 is an abundant number, since it is smaller than the sum of its proper divisors (437600).

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

397780 is a wasteful number, since it uses less digits than its factorization.

397780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19898 (or 19896 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 397780 is about 630.6980259998. The cubic root of 397780 is about 73.5440678550.

The spelling of 397780 in words is "three hundred ninety-seven thousand, seven hundred eighty".