981890 has 48 divisors (see below), whose sum is σ = 2213568. Its totient is φ = 307008.

The previous prime is 981889. The next prime is 981913. The reversal of 981890 is 98189.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 981890.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981890.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11789 + ... + 11871.

It is an arithmetic number, because the mean of its divisors is an integer number (46116).

2⁹⁸¹⁸⁹⁰ is an apocalyptic number.

981890 is an abundant number, since it is smaller than the sum of its proper divisors (1231678).

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

981890 is a wasteful number, since it uses less digits than its factorization.

981890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 981890 is about 990.9036280083. The cubic root of 981890 is about 99.3926520862.

The spelling of 981890 in words is "nine hundred eighty-one thousand, eight hundred ninety".