397678 has 4 divisors (see below), whose sum is σ = 596520. Its totient is φ = 198838.

The previous prime is 397673. The next prime is 397687. The reversal of 397678 is 876793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 876793 = 19 ⋅46147.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 3³ + 9 + 6⁷ + 7² + 7⁶ + 8 .

It is a self number, because there is not a number n which added to its sum of digits gives 397678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99418 + ... + 99421.

It is an arithmetic number, because the mean of its divisors is an integer number (149130).

2³⁹⁷⁶⁷⁸ is an apocalyptic number.

397678 is a deficient number, since it is larger than the sum of its proper divisors (198842).

397678 is a wasteful number, since it uses less digits than its factorization.

397678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198841.

The product of its digits is 63504, while the sum is 40.

The square root of 397678 is about 630.6171580285. The cubic root of 397678 is about 73.5377811838.

The spelling of 397678 in words is "three hundred ninety-seven thousand, six hundred seventy-eight".