981859 has 4 divisors (see below), whose sum is σ = 995760. Its totient is φ = 967960.

The previous prime is 981823. The next prime is 981887. The reversal of 981859 is 958189.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 981859 - 2⁷ = 981731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981809) 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, 6844 + ... + 6985.

It is an arithmetic number, because the mean of its divisors is an integer number (248940).

2⁹⁸¹⁸⁵⁹ is an apocalyptic number.

981859 is a deficient number, since it is larger than the sum of its proper divisors (13901).

981859 is a wasteful number, since it uses less digits than its factorization.

981859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13900.

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

The square root of 981859 is about 990.8879855968. The cubic root of 981859 is about 99.3916060747.

The spelling of 981859 in words is "nine hundred eighty-one thousand, eight hundred fifty-nine".