397984 has 12 divisors (see below), whose sum is σ = 783594. Its totient is φ = 198976.

The previous prime is 397981. The next prime is 398011. The reversal of 397984 is 489793.

It can be written as a sum of positive squares in only one way, i.e., 394384 + 3600 = 628^2 + 60^2 .

It is not an unprimeable number, because it can be changed into a prime (397981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6187 + ... + 6250.

2³⁹⁷⁹⁸⁴ is an apocalyptic number.

It is an amenable number.

397984 is a deficient number, since it is larger than the sum of its proper divisors (385610).

397984 is a wasteful number, since it uses less digits than its factorization.

397984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12447 (or 12439 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The square root of 397984 is about 630.8597308436. The cubic root of 397984 is about 73.5566379740.

Subtracting 397984 from its reverse (489793), we obtain a square (91809 = 303²).

The spelling of 397984 in words is "three hundred ninety-seven thousand, nine hundred eighty-four".