981598 has 8 divisors (see below), whose sum is σ = 1480608. Its totient is φ = 488064.

The previous prime is 981587. The next prime is 981599. The reversal of 981598 is 895189.

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 981598.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 886 + ... + 1657.

It is an arithmetic number, because the mean of its divisors is an integer number (185076).

2⁹⁸¹⁵⁹⁸ is an apocalyptic number.

981598 is a deficient number, since it is larger than the sum of its proper divisors (499010).

981598 is a wasteful number, since it uses less digits than its factorization.

981598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738.

The product of its digits is 25920, while the sum is 40.

The square root of 981598 is about 990.7562767906. The cubic root of 981598 is about 99.3827984598.

The spelling of 981598 in words is "nine hundred eighty-one thousand, five hundred ninety-eight".