99997745 has 4 divisors (see below), whose sum is σ = 119997300. Its totient is φ = 79998192.

The previous prime is 99997691. The next prime is 99997759. The reversal of 99997745 is 54779999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54779999 = 149 ⋅367651.

It can be written as a sum of positive squares in 2 ways, for example, as 11336689 + 88661056 = 3367^2 + 9416^2 .

It is a cyclic number.

It is not a de Polignac number, because 99997745 - 2²⁶ = 32888881 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9999770 + ... + 9999779.

It is an arithmetic number, because the mean of its divisors is an integer number (29999325).

Almost surely, 2^99997745 is an apocalyptic number.

It is an amenable number.

99997745 is a deficient number, since it is larger than the sum of its proper divisors (19999555).

99997745 is a wasteful number, since it uses less digits than its factorization.

99997745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19999554.

The product of its digits is 6429780, while the sum is 59.

The square root of 99997745 is about 9999.8872493644. The cubic root of 99997745 is about 464.1553944074.

The spelling of 99997745 in words is "ninety-nine million, nine hundred ninety-seven thousand, seven hundred forty-five".