398386 has 4 divisors (see below), whose sum is σ = 597582. Its totient is φ = 199192.

The previous prime is 398369. The next prime is 398393. The reversal of 398386 is 683893.

It is a happy number.

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., 398161 + 225 = 631^2 + 15^2 .

It is a super-2 number, since 2×398386² = 317422809992, which contains 22 as substring.

It is a nialpdrome in base 9.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99595 + ... + 99598.

2³⁹⁸³⁸⁶ is an apocalyptic number.

398386 is a deficient number, since it is larger than the sum of its proper divisors (199196).

398386 is a wasteful number, since it uses less digits than its factorization.

398386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199195.

The product of its digits is 31104, while the sum is 37.

The square root of 398386 is about 631.1782632506. The cubic root of 398386 is about 73.5813959358.

It can be divided in two parts, 398 and 386, that added together give a square (784 = 28²).

The spelling of 398386 in words is "three hundred ninety-eight thousand, three hundred eighty-six".