844909987 has 2 divisors, whose sum is σ = 844909988. Its totient is φ = 844909986.

The previous prime is 844909937. The next prime is 844910051. The reversal of 844909987 is 789909448.

844909987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-844909987 is a prime.

It is a super-2 number, since 2×844909987² = 1427745772264680338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (844909907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422454993 + 422454994.

It is an arithmetic number, because the mean of its divisors is an integer number (422454994).

Almost surely, 2^844909987 is an apocalyptic number.

844909987 is a deficient number, since it is larger than the sum of its proper divisors (1).

844909987 is an equidigital number, since it uses as much as digits as its factorization.

844909987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The square root of 844909987 is about 29067.3353955948. The cubic root of 844909987 is about 945.3736238055.

The spelling of 844909987 in words is "eight hundred forty-four million, nine hundred nine thousand, nine hundred eighty-seven".