398578 has 4 divisors (see below), whose sum is σ = 597870. Its totient is φ = 199288.

The previous prime is 398569. The next prime is 398581. The reversal of 398578 is 875893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 363609 + 34969 = 603^2 + 187^2 .

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 an Ulam number.

It is a nialpdrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 398578.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99643 + ... + 99646.

2³⁹⁸⁵⁷⁸ is an apocalyptic number.

398578 is a deficient number, since it is larger than the sum of its proper divisors (199292).

398578 is a wasteful number, since it uses less digits than its factorization.

398578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199291.

The product of its digits is 60480, while the sum is 40.

The square root of 398578 is about 631.3303414220. The cubic root of 398578 is about 73.5932147573.

The spelling of 398578 in words is "three hundred ninety-eight thousand, five hundred seventy-eight".