99873820 has 24 divisors (see below), whose sum is σ = 218854944. Its totient is φ = 38212416.

The previous prime is 99873811. The next prime is 99873853. The reversal of 99873820 is 2837899.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108099 + ... + 109018.

It is an arithmetic number, because the mean of its divisors is an integer number (9118956).

Almost surely, 2^99873820 is an apocalyptic number.

It is an amenable number.

99873820 is an abundant number, since it is smaller than the sum of its proper divisors (118981124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99873820 is a wasteful number, since it uses less digits than its factorization.

99873820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217149 (or 217147 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 99873820 is about 9993.6890085694. The cubic root of 99873820 is about 463.9635759656.

The spelling of 99873820 in words is "ninety-nine million, eight hundred seventy-three thousand, eight hundred twenty".