981858 has 8 divisors (see below), whose sum is σ = 1963728. Its totient is φ = 327284.

The previous prime is 981823. The next prime is 981887. The reversal of 981858 is 858189.

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

981858 is an admirable number.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 81816 + ... + 81827.

It is an arithmetic number, because the mean of its divisors is an integer number (245466).

2⁹⁸¹⁸⁵⁸ is an apocalyptic number.

981858 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981858 is a wasteful number, since it uses less digits than its factorization.

981858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163648.

The product of its digits is 23040, while the sum is 39.

The square root of 981858 is about 990.8874809987. The cubic root of 981858 is about 99.3915723321.

The spelling of 981858 in words is "nine hundred eighty-one thousand, eight hundred fifty-eight".