99724919 has 4 divisors (see below), whose sum is σ = 113971344. Its totient is φ = 85478496.

The previous prime is 99724913. The next prime is 99724921. The reversal of 99724919 is 91942799.

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 99724919 - 2¹² = 99720823 is a prime.

It is a super-2 number, since 2×99724919² = 19890118939113122, 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 (99724913) 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, 7123202 + ... + 7123215.

It is an arithmetic number, because the mean of its divisors is an integer number (28492836).

Almost surely, 2^99724919 is an apocalyptic number.

99724919 is a deficient number, since it is larger than the sum of its proper divisors (14246425).

99724919 is a wasteful number, since it uses less digits than its factorization.

99724919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14246424.

The product of its digits is 367416, while the sum is 50.

The square root of 99724919 is about 9986.2364782735. The cubic root of 99724919 is about 463.7328882123.

The spelling of 99724919 in words is "ninety-nine million, seven hundred twenty-four thousand, nine hundred nineteen".