840020099 has 16 divisors (see below), whose sum is σ = 941207040. Its totient is φ = 745557120.

The previous prime is 840020087. The next prime is 840020117. The reversal of 840020099 is 990020048.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840020099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840020059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12632 + ... + 42890.

It is an arithmetic number, because the mean of its divisors is an integer number (58825440).

Almost surely, 2^840020099 is an apocalyptic number.

840020099 is a deficient number, since it is larger than the sum of its proper divisors (101186941).

840020099 is a wasteful number, since it uses less digits than its factorization.

840020099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30370.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 840020099 is about 28983.1002309967. The cubic root of 840020099 is about 943.5463214740.

The spelling of 840020099 in words is "eight hundred forty million, twenty thousand, ninety-nine".