98721823 has 4 divisors (see below), whose sum is σ = 98804160. Its totient is φ = 98639488.

The previous prime is 98721817. The next prime is 98721841. The reversal of 98721823 is 32812789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32812789 = 23 ⋅1426643.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98721823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98721863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39343 + ... + 41776.

It is an arithmetic number, because the mean of its divisors is an integer number (24701040).

Almost surely, 2^98721823 is an apocalyptic number.

98721823 is a deficient number, since it is larger than the sum of its proper divisors (82337).

98721823 is a wasteful number, since it uses less digits than its factorization.

98721823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82336.

The product of its digits is 48384, while the sum is 40.

The square root of 98721823 is about 9935.8856172965. The cubic root of 98721823 is about 462.1728066158.

The spelling of 98721823 in words is "ninety-eight million, seven hundred twenty-one thousand, eight hundred twenty-three".