99864919 has 64 divisors (see below), whose sum is σ = 143327232. Its totient is φ = 67161600.

The previous prime is 99864881. The next prime is 99864929. The reversal of 99864919 is 91946899.

It is not a de Polignac number, because 99864919 - 2⁹ = 99864407 is a prime.

It is a super-2 number, since 2×99864919² = 19946004093753122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99864919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99864929) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 933264 + ... + 933370.

It is an arithmetic number, because the mean of its divisors is an integer number (2239488).

Almost surely, 2^99864919 is an apocalyptic number.

99864919 is a deficient number, since it is larger than the sum of its proper divisors (43462313).

99864919 is a wasteful number, since it uses less digits than its factorization.

99864919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196.

The product of its digits is 1259712, while the sum is 55.

The square root of 99864919 is about 9993.2436675986. The cubic root of 99864919 is about 463.9497923652.

The spelling of 99864919 in words is "ninety-nine million, eight hundred sixty-four thousand, nine hundred nineteen".