999745 has 8 divisors (see below), whose sum is σ = 1215360. Its totient is φ = 789360.

The previous prime is 999727. The next prime is 999749. The reversal of 999745 is 547999.

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

It is not a de Polignac number, because 999745 - 2⁹ = 999233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871 + ... + 1660.

It is an arithmetic number, because the mean of its divisors is an integer number (151920).

2⁹⁹⁹⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

999745 is a deficient number, since it is larger than the sum of its proper divisors (215615).

999745 is a wasteful number, since it uses less digits than its factorization.

999745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615.

The product of its digits is 102060, while the sum is 43.

The square root of 999745 is about 999.8724918708. The cubic root of 999745 is about 99.9914992774.

The spelling of 999745 in words is "nine hundred ninety-nine thousand, seven hundred forty-five".