99990945 has 24 divisors (see below), whose sum is σ = 174433896. Its totient is φ = 52985088.

The previous prime is 99990929. The next prime is 99990967. The reversal of 99990945 is 54909999.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2396304 + 97594641 = 1548^2 + 9879^2 .

It is not a de Polignac number, because 99990945 - 2⁴ = 99990929 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 99990891 and 99990900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12 + ... + 14141.

It is an arithmetic number, because the mean of its divisors is an integer number (7268079).

Almost surely, 2^99990945 is an apocalyptic number.

It is an amenable number.

99990945 is a deficient number, since it is larger than the sum of its proper divisors (74442951).

99990945 is a wasteful number, since it uses less digits than its factorization.

99990945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14321 (or 14318 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 54.

The square root of 99990945 is about 9999.5472397504. The cubic root of 99990945 is about 464.1448730761.

The spelling of 99990945 in words is "ninety-nine million, nine hundred ninety thousand, nine hundred forty-five".