398078 has 4 divisors (see below), whose sum is σ = 597120. Its totient is φ = 199038.

The previous prime is 398077. The next prime is 398087. The reversal of 398078 is 870893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 870893 = 17 ⋅51229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398077) 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, 99518 + ... + 99521.

It is an arithmetic number, because the mean of its divisors is an integer number (149280).

2³⁹⁸⁰⁷⁸ is an apocalyptic number.

398078 is a deficient number, since it is larger than the sum of its proper divisors (199042).

398078 is a wasteful number, since it uses less digits than its factorization.

398078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199041.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 398078 is about 630.9342279509. The cubic root of 398078 is about 73.5624286420.

The spelling of 398078 in words is "three hundred ninety-eight thousand, seventy-eight".