99999719 has 4 divisors (see below), whose sum is σ = 100225896. Its totient is φ = 99773544.

The previous prime is 99999703. The next prime is 99999721. The reversal of 99999719 is 91799999.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99999719 - 2⁴ = 99999703 is a prime.

It is a super-2 number, since 2×99999719² = 19999887600157922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99996719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112424 + ... + 113309.

It is an arithmetic number, because the mean of its divisors is an integer number (25056474).

Almost surely, 2^99999719 is an apocalyptic number.

99999719 is a deficient number, since it is larger than the sum of its proper divisors (226177).

99999719 is a wasteful number, since it uses less digits than its factorization.

99999719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226176.

The product of its digits is 3720087, while the sum is 62.

The square root of 99999719 is about 9999.9859499901. The cubic root of 99999719 is about 464.1584485987.

The spelling of 99999719 in words is "ninety-nine million, nine hundred ninety-nine thousand, seven hundred nineteen".