981885 has 16 divisors (see below), whose sum is σ = 1596096. Its totient is φ = 515328.

The previous prime is 981823. The next prime is 981887. The reversal of 981885 is 588189.

981885 = 225² + 226² + ... + 242².

It is not a de Polignac number, because 981885 - 2⁹ = 981373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 517 + ... + 1493.

It is an arithmetic number, because the mean of its divisors is an integer number (99756).

2⁹⁸¹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

981885 is a deficient number, since it is larger than the sum of its proper divisors (614211).

981885 is a wasteful number, since it uses less digits than its factorization.

981885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052.

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

The square root of 981885 is about 990.9011050554. The cubic root of 981885 is about 99.3924833762.

The spelling of 981885 in words is "nine hundred eighty-one thousand, eight hundred eighty-five".