99840479 has 2 divisors, whose sum is σ = 99840480. Its totient is φ = 99840478.

The previous prime is 99840463. The next prime is 99840487. The reversal of 99840479 is 97404899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99840479 - 2⁴ = 99840463 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99840409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49920239 + 49920240.

It is an arithmetic number, because the mean of its divisors is an integer number (49920240).

Almost surely, 2^99840479 is an apocalyptic number.

99840479 is a deficient number, since it is larger than the sum of its proper divisors (1).

99840479 is an equidigital number, since it uses as much as digits as its factorization.

99840479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 99840479 is about 9992.0207665917. The cubic root of 99840479 is about 463.9119417093.

The spelling of 99840479 in words is "ninety-nine million, eight hundred forty thousand, four hundred seventy-nine".