981905 has 8 divisors (see below), whose sum is σ = 1205952. Its totient is φ = 767088.

The previous prime is 981889. The next prime is 981913. The reversal of 981905 is 509189.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 981905 - 2⁴ = 981889 is a prime.

It is a Duffinian number.

It is a Curzon 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, 2069 + ... + 2498.

It is an arithmetic number, because the mean of its divisors is an integer number (150744).

2⁹⁸¹⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

981905 is a deficient number, since it is larger than the sum of its proper divisors (224047).

981905 is a wasteful number, since it uses less digits than its factorization.

981905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 981905 is about 990.9111968285. The cubic root of 981905 is about 99.3931582129.

The spelling of 981905 in words is "nine hundred eighty-one thousand, nine hundred five".