99999423 has 48 divisors (see below), whose sum is σ = 161493696. Its totient is φ = 59304960.

The previous prime is 99999401. The next prime is 99999437. The reversal of 99999423 is 32499999.

It is not a de Polignac number, because 99999423 - 2⁸ = 99999167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99999423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 552393 + ... + 552573.

It is an arithmetic number, because the mean of its divisors is an integer number (3364452).

Almost surely, 2^99999423 is an apocalyptic number.

99999423 is a deficient number, since it is larger than the sum of its proper divisors (61494273).

99999423 is a wasteful number, since it uses less digits than its factorization.

99999423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 381 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 54.

The square root of 99999423 is about 9999.9711499584. The cubic root of 99999423 is about 464.1579906273.

The spelling of 99999423 in words is "ninety-nine million, nine hundred ninety-nine thousand, four hundred twenty-three".