99999807 has 4 divisors (see below), whose sum is σ = 133333080. Its totient is φ = 66666536.

The previous prime is 99999787. The next prime is 99999821. The reversal of 99999807 is 70899999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70899999 = 3 ⋅23633333.

It is a cyclic number.

It is not a de Polignac number, because 99999807 - 2⁸ = 99999551 is a prime.

It is a super-2 number, since 2×99999807² = 19999922800074498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999827) 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 3 ways as a sum of consecutive naturals, for example, 16666632 + ... + 16666637.

It is an arithmetic number, because the mean of its divisors is an integer number (33333270).

Almost surely, 2^99999807 is an apocalyptic number.

99999807 is a deficient number, since it is larger than the sum of its proper divisors (33333273).

99999807 is a wasteful number, since it uses less digits than its factorization.

99999807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33333272.

The product of its (nonzero) digits is 3306744, while the sum is 60.

The square root of 99999807 is about 9999.9903499953. The cubic root of 99999807 is about 464.1585847522.

The spelling of 99999807 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred seven".