398138 has 8 divisors (see below), whose sum is σ = 643188. Its totient is φ = 183744.

The previous prime is 398129. The next prime is 398143. The reversal of 398138 is 831893.

It can be written as a sum of positive squares in 2 ways, for example, as 277729 + 120409 = 527^2 + 347^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7631 + ... + 7682.

2³⁹⁸¹³⁸ is an apocalyptic number.

398138 is a deficient number, since it is larger than the sum of its proper divisors (245050).

398138 is a wasteful number, since it uses less digits than its factorization.

398138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15328.

The product of its digits is 5184, while the sum is 32.

The square root of 398138 is about 630.9817746972. The cubic root of 398138 is about 73.5661243365.

The spelling of 398138 in words is "three hundred ninety-eight thousand, one hundred thirty-eight".