99999945 has 24 divisors (see below), whose sum is σ = 182457600. Its totient is φ = 50525856.

The previous prime is 99999941. The next prime is 99999959. The reversal of 99999945 is 54999999.

It is not a de Polignac number, because 99999945 - 2² = 99999941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99999941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57625 + ... + 59334.

It is an arithmetic number, because the mean of its divisors is an integer number (7602400).

Almost surely, 2^99999945 is an apocalyptic number.

99999945 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

99999945 is a deficient number, since it is larger than the sum of its proper divisors (82457655).

99999945 is a wasteful number, since it uses less digits than its factorization.

99999945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116989 (or 116986 counting only the distinct ones).

The product of its digits is 10628820, while the sum is 63.

The square root of 99999945 is about 9999.9972499996. The cubic root of 99999945 is about 464.1587982655.

It can be divided in two parts, 9999994 and 5, that added together give a palindrome (9999999).

The spelling of 99999945 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-five".