990236887 has 2 divisors, whose sum is σ = 990236888. Its totient is φ = 990236886.

The previous prime is 990236867. The next prime is 990236909. The reversal of 990236887 is 788632099.

It is a weak prime.

It is an emirp because it is prime and its reverse (788632099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990236887 - 2²⁷ = 856019159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990236827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495118443 + 495118444.

It is an arithmetic number, because the mean of its divisors is an integer number (495118444).

Almost surely, 2^990236887 is an apocalyptic number.

990236887 is a deficient number, since it is larger than the sum of its proper divisors (1).

990236887 is an equidigital number, since it uses as much as digits as its factorization.

990236887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 990236887 is about 31468.0296014860. The cubic root of 990236887 is about 996.7349802481.

The spelling of 990236887 in words is "nine hundred ninety million, two hundred thirty-six thousand, eight hundred eighty-seven".