981855 has 32 divisors (see below), whose sum is σ = 1996800. Its totient is φ = 448416.

The previous prime is 981823. The next prime is 981887. The reversal of 981855 is 558189.

It is an interprime number because it is at equal distance from previous prime (981823) and next prime (981887).

It is not a de Polignac number, because 981855 - 2⁵ = 981823 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 426 + ... + 1464.

It is an arithmetic number, because the mean of its divisors is an integer number (62400).

2⁹⁸¹⁸⁵⁵ is an apocalyptic number.

981855 is an abundant number, since it is smaller than the sum of its proper divisors (1014945).

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

981855 is a wasteful number, since it uses less digits than its factorization.

981855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060 (or 1054 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 981855 is about 990.8859672031. The cubic root of 981855 is about 99.3914711039.

It can be divided in two parts, 98 and 1855, that added together give a triangular number (1953 = T₆₂).

The spelling of 981855 in words is "nine hundred eighty-one thousand, eight hundred fifty-five".