981906 has 16 divisors (see below), whose sum is σ = 2017344. Its totient is φ = 318384.

The previous prime is 981889. The next prime is 981913. The reversal of 981906 is 609189.

It is a happy number.

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

981906 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 1990 + ... + 2433.

It is an arithmetic number, because the mean of its divisors is an integer number (126084).

2⁹⁸¹⁹⁰⁶ is an apocalyptic number.

981906 is an abundant number, since it is smaller than the sum of its proper divisors (1035438).

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

981906 is a wasteful number, since it uses less digits than its factorization.

981906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4465.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 981906 is about 990.9117014144. The cubic root of 981906 is about 99.3931919545.

The spelling of 981906 in words is "nine hundred eighty-one thousand, nine hundred six".