99919924 has 12 divisors (see below), whose sum is σ = 188310724. Its totient is φ = 46116864.

The previous prime is 99919921. The next prime is 99919949. The reversal of 99919924 is 42991999.

It can be written as a sum of positive squares in 2 ways, for example, as 6411024 + 93508900 = 2532^2 + 9670^2 .

It is a Harshad number since it is a multiple of its sum of digits (52), and also a Moran number because the ratio is a prime number: 1921537 = 99919924 / (9 + 9 + 9 + 1 + 9 + 9 + 2 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99919921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960717 + ... + 960820.

Almost surely, 2^99919924 is an apocalyptic number.

It is an amenable number.

99919924 is a deficient number, since it is larger than the sum of its proper divisors (88390800).

99919924 is a wasteful number, since it uses less digits than its factorization.

99919924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921554 (or 1921552 counting only the distinct ones).

The product of its digits is 472392, while the sum is 52.

The square root of 99919924 is about 9995.9953981582. The cubic root of 99919924 is about 464.0349569878.

The spelling of 99919924 in words is "ninety-nine million, nine hundred nineteen thousand, nine hundred twenty-four".