87840899 has 2 divisors, whose sum is σ = 87840900. Its totient is φ = 87840898.

The previous prime is 87840847. The next prime is 87840919. The reversal of 87840899 is 99804878.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87840899 - 2¹² = 87836803 is a prime.

It is a super-3 number, since 3×87840899³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87840899.

It is not a weakly prime, because it can be changed into another prime (87840829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43920449 + 43920450.

It is an arithmetic number, because the mean of its divisors is an integer number (43920450).

Almost surely, 2^87840899 is an apocalyptic number.

87840899 is a deficient number, since it is larger than the sum of its proper divisors (1).

87840899 is an equidigital number, since it uses as much as digits as its factorization.

87840899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The square root of 87840899 is about 9372.3475714465. The cubic root of 87840899 is about 444.5277977253.

The spelling of 87840899 in words is "eighty-seven million, eight hundred forty thousand, eight hundred ninety-nine".