999997745 has 8 divisors (see below), whose sum is σ = 1200225600. Its totient is φ = 799846000.

The previous prime is 999997717. The next prime is 999997769. The reversal of 999997745 is 547799999.

999997745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 999997745 - 2⁸ = 999997489 is a prime.

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, 15620 + ... + 47370.

It is an arithmetic number, because the mean of its divisors is an integer number (150028200).

Almost surely, 2^999997745 is an apocalyptic number.

It is an amenable number.

999997745 is a deficient number, since it is larger than the sum of its proper divisors (200227855).

999997745 is a wasteful number, since it uses less digits than its factorization.

999997745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38055.

The product of its digits is 57868020, while the sum is 68.

The square root of 999997745 is about 31622.7409469831. The cubic root of 999997745 is about 999.9992483328. Note that the first 3 decimals are identical.

The spelling of 999997745 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred forty-five".