99840869 has 2 divisors, whose sum is σ = 99840870. Its totient is φ = 99840868.

The previous prime is 99840821. The next prime is 99840899. The reversal of 99840869 is 96804899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62995969 + 36844900 = 7937^2 + 6070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99840869 is a prime.

It is a super-2 number, since 2×99840869² = 19936398245350322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99840869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99840809) 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 as a sum of consecutive naturals, namely, 49920434 + 49920435.

It is an arithmetic number, because the mean of its divisors is an integer number (49920435).

Almost surely, 2^99840869 is an apocalyptic number.

It is an amenable number.

99840869 is a deficient number, since it is larger than the sum of its proper divisors (1).

99840869 is an equidigital number, since it uses as much as digits as its factorization.

99840869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 99840869 is about 9992.0402821446. The cubic root of 99840869 is about 463.9125457576.

The spelling of 99840869 in words is "ninety-nine million, eight hundred forty thousand, eight hundred sixty-nine".