981398 has 16 divisors (see below), whose sum is σ = 1658880. Its totient is φ = 431400.

The previous prime is 981397. The next prime is 981419. The reversal of 981398 is 893189.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981398.

It is not an unprimeable number, because it can be changed into a prime (981391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38 + ... + 1401.

It is an arithmetic number, because the mean of its divisors is an integer number (103680).

2⁹⁸¹³⁹⁸ is an apocalyptic number.

981398 is a deficient number, since it is larger than the sum of its proper divisors (677482).

981398 is a wasteful number, since it uses less digits than its factorization.

981398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483.

The product of its digits is 15552, while the sum is 38.

The square root of 981398 is about 990.6553386521. The cubic root of 981398 is about 99.3760482729.

Subtracting from 981398 its reverse (893189), we obtain a square (88209 = 297²).

The spelling of 981398 in words is "nine hundred eighty-one thousand, three hundred ninety-eight".