981973865 has 8 divisors (see below), whose sum is σ = 1240388160. Its totient is φ = 744232752.

The previous prime is 981973859. The next prime is 981973919. The reversal of 981973865 is 568379189.

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 981973865 - 2⁴ = 981973849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 981973865.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5168189 + ... + 5168378.

It is an arithmetic number, because the mean of its divisors is an integer number (155048520).

Almost surely, 2^981973865 is an apocalyptic number.

981973865 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

981973865 is a deficient number, since it is larger than the sum of its proper divisors (258414295).

981973865 is a wasteful number, since it uses less digits than its factorization.

981973865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10336591.

The product of its digits is 3265920, while the sum is 56.

The square root of 981973865 is about 31336.4622285286. The cubic root of 981973865 is about 993.9548177437.

The spelling of 981973865 in words is "nine hundred eighty-one million, nine hundred seventy-three thousand, eight hundred sixty-five".