398758 has 4 divisors (see below), whose sum is σ = 598140. Its totient is φ = 199378.

The previous prime is 398731. The next prime is 398759. The reversal of 398758 is 857893.

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

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 self number, because there is not a number n which added to its sum of digits gives 398758.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99688 + ... + 99691.

It is an arithmetic number, because the mean of its divisors is an integer number (149535).

2³⁹⁸⁷⁵⁸ is an apocalyptic number.

398758 is a deficient number, since it is larger than the sum of its proper divisors (199382).

398758 is a wasteful number, since it uses less digits than its factorization.

398758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199381.

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

The square root of 398758 is about 631.4728814446. The cubic root of 398758 is about 73.6042914558.

It can be divided in two parts, 398 and 758, that added together give a square (1156 = 34²).

The spelling of 398758 in words is "three hundred ninety-eight thousand, seven hundred fifty-eight".