99923861 has 4 divisors (see below), whose sum is σ = 101188800. Its totient is φ = 98658924.

The previous prime is 99923851. The next prime is 99923893. The reversal of 99923861 is 16832999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16832999 = 647 ⋅26017.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99923861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99923801) 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, 632351 + ... + 632508.

It is an arithmetic number, because the mean of its divisors is an integer number (25297200).

Almost surely, 2^99923861 is an apocalyptic number.

It is an amenable number.

99923861 is a deficient number, since it is larger than the sum of its proper divisors (1264939).

99923861 is a wasteful number, since it uses less digits than its factorization.

99923861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264938.

The product of its digits is 209952, while the sum is 47.

The square root of 99923861 is about 9996.1923250806. The cubic root of 99923861 is about 464.0410514735.

The spelling of 99923861 in words is "ninety-nine million, nine hundred twenty-three thousand, eight hundred sixty-one".