398974 has 4 divisors (see below), whose sum is σ = 598464. Its totient is φ = 199486.

The previous prime is 398969. The next prime is 398977. The reversal of 398974 is 479893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 479893 = 17 ⋅28229.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (398977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99742 + ... + 99745.

It is an arithmetic number, because the mean of its divisors is an integer number (149616).

2³⁹⁸⁹⁷⁴ is an apocalyptic number.

398974 is a deficient number, since it is larger than the sum of its proper divisors (199490).

398974 is a wasteful number, since it uses less digits than its factorization.

398974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199489.

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

The square root of 398974 is about 631.6438870123. The cubic root of 398974 is about 73.6175790949.

The spelling of 398974 in words is "three hundred ninety-eight thousand, nine hundred seventy-four".