981844993 has 8 divisors (see below), whose sum is σ = 1003197312. Its totient is φ = 960512016.

The previous prime is 981844973. The next prime is 981845017. The reversal of 981844993 is 399448189.

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 981844993 - 2²⁹ = 444974081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981844933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152271 + ... + 158587.

It is an arithmetic number, because the mean of its divisors is an integer number (125399664).

Almost surely, 2^981844993 is an apocalyptic number.

It is an amenable number.

981844993 is a deficient number, since it is larger than the sum of its proper divisors (21352319).

981844993 is a wasteful number, since it uses less digits than its factorization.

981844993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9671.

The product of its digits is 2239488, while the sum is 55.

The square root of 981844993 is about 31334.4058983093. The cubic root of 981844993 is about 993.9113343905.

The spelling of 981844993 in words is "nine hundred eighty-one million, eight hundred forty-four thousand, nine hundred ninety-three".