981745 has 8 divisors (see below), whose sum is σ = 1207080. Its totient is φ = 766080.

The previous prime is 981731. The next prime is 981769. The reversal of 981745 is 547189.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 46656 + 935089 = 216^2 + 967^2 .

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

It is not a de Polignac number, because 981745 - 2⁵ = 981713 is a prime.

981745 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 981745.

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, 2190 + ... + 2599.

It is an arithmetic number, because the mean of its divisors is an integer number (150885).

2⁹⁸¹⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

981745 is a deficient number, since it is larger than the sum of its proper divisors (225335).

981745 is a wasteful number, since it uses less digits than its factorization.

981745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4835.

The product of its digits is 10080, while the sum is 34.

The square root of 981745 is about 990.8304597659. The cubic root of 981745 is about 99.3877592625.

The spelling of 981745 in words is "nine hundred eighty-one thousand, seven hundred forty-five".