398438578 has 4 divisors (see below), whose sum is σ = 597657870. Its totient is φ = 199219288.

The previous prime is 398438561. The next prime is 398438587. The reversal of 398438578 is 875834893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 875834893 = 191 ⋅4585523.

It can be written as a sum of positive squares in only one way, i.e., 375080689 + 23357889 = 19367^2 + 4833^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99609643 + ... + 99609646.

Almost surely, 2^398438578 is an apocalyptic number.

398438578 is a deficient number, since it is larger than the sum of its proper divisors (199219292).

398438578 is a wasteful number, since it uses less digits than its factorization.

398438578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199219291.

The product of its digits is 5806080, while the sum is 55.

The square root of 398438578 is about 19960.9262811123. The cubic root of 398438578 is about 735.8463282368.

It can be divided in two parts, 398 and 438578, that added together give a cube (438976 = 76³).

The spelling of 398438578 in words is "three hundred ninety-eight million, four hundred thirty-eight thousand, five hundred seventy-eight".