397994 has 4 divisors (see below), whose sum is σ = 596994. Its totient is φ = 198996.

The previous prime is 397981. The next prime is 398011. The reversal of 397994 is 499793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499793 = 7 ⋅71399.

It can be written as a sum of positive squares in only one way, i.e., 207025 + 190969 = 455^2 + 437^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99497 + ... + 99500.

2³⁹⁷⁹⁹⁴ is an apocalyptic number.

397994 is a deficient number, since it is larger than the sum of its proper divisors (199000).

397994 is a wasteful number, since it uses less digits than its factorization.

397994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198999.

The product of its digits is 61236, while the sum is 41.

The square root of 397994 is about 630.8676564859. The cubic root of 397994 is about 73.5572540459.

The spelling of 397994 in words is "three hundred ninety-seven thousand, nine hundred ninety-four".