99640327 has 2 divisors, whose sum is σ = 99640328. Its totient is φ = 99640326.

The previous prime is 99640309. The next prime is 99640337. The reversal of 99640327 is 72304699.

It is a strong prime.

It is an emirp because it is prime and its reverse (72304699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99640327 - 2¹⁵ = 99607559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99640327.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99640337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49820163 + 49820164.

It is an arithmetic number, because the mean of its divisors is an integer number (49820164).

Almost surely, 2^99640327 is an apocalyptic number.

99640327 is a deficient number, since it is larger than the sum of its proper divisors (1).

99640327 is an equidigital number, since it uses as much as digits as its factorization.

99640327 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 99640327 is about 9982.0001502705. Note that the first 3 decimals coincide. The cubic root of 99640327 is about 463.6017301230.

The spelling of 99640327 in words is "ninety-nine million, six hundred forty thousand, three hundred twenty-seven".