981830 has 16 divisors (see below), whose sum is σ = 1805760. Its totient is φ = 384192.

The previous prime is 981823. The next prime is 981887. The reversal of 981830 is 38189.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 981793 and 981802.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 575 + ... + 1514.

It is an arithmetic number, because the mean of its divisors is an integer number (112860).

2⁹⁸¹⁸³⁰ is an apocalyptic number.

981830 is a deficient number, since it is larger than the sum of its proper divisors (823930).

981830 is a wasteful number, since it uses less digits than its factorization.

981830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 981830 is about 990.8733521495. The cubic root of 981830 is about 99.3906275279.

The spelling of 981830 in words is "nine hundred eighty-one thousand, eight hundred thirty".