99409923 has 20 divisors (see below), whose sum is σ = 149410800. Its totient is φ = 65867472.

The previous prime is 99409909. The next prime is 99409949. The reversal of 99409923 is 32990499.

It is not a de Polignac number, because 99409923 - 2¹⁶ = 99344387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99409903) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9853 + ... + 17201.

It is an arithmetic number, because the mean of its divisors is an integer number (7470540).

Almost surely, 2^99409923 is an apocalyptic number.

99409923 is a deficient number, since it is larger than the sum of its proper divisors (50000877).

99409923 is a wasteful number, since it uses less digits than its factorization.

99409923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7528 (or 7519 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 99409923 is about 9970.4524972541. The cubic root of 99409923 is about 463.2441167811.

The spelling of 99409923 in words is "ninety-nine million, four hundred nine thousand, nine hundred twenty-three".