99839840 has 48 divisors (see below), whose sum is σ = 243492480. Its totient is φ = 38645760.

The previous prime is 99839807. The next prime is 99839843. The reversal of 99839840 is 4893899.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99839843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5105 + ... + 15024.

It is an arithmetic number, because the mean of its divisors is an integer number (5072760).

Almost surely, 2^99839840 is an apocalyptic number.

It is an amenable number.

99839840 is an abundant number, since it is smaller than the sum of its proper divisors (143652640).

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

99839840 is a wasteful number, since it uses less digits than its factorization.

99839840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20175 (or 20167 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 99839840 is about 9991.9887910265. The cubic root of 99839840 is about 463.9109519960.

The spelling of 99839840 in words is "ninety-nine million, eight hundred thirty-nine thousand, eight hundred forty".