990000787 has 2 divisors, whose sum is σ = 990000788. Its totient is φ = 990000786.

The previous prime is 990000761. The next prime is 990000793. The reversal of 990000787 is 787000099.

It is a strong prime.

It is an emirp because it is prime and its reverse (787000099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990000787 - 2¹⁵ = 989968019 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (990000887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495000393 + 495000394.

It is an arithmetic number, because the mean of its divisors is an integer number (495000394).

Almost surely, 2^990000787 is an apocalyptic number.

990000787 is a deficient number, since it is larger than the sum of its proper divisors (1).

990000787 is an equidigital number, since it uses as much as digits as its factorization.

990000787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 990000787 is about 31464.2779513530. The cubic root of 990000787 is about 996.6557575095.

The spelling of 990000787 in words is "nine hundred ninety million, seven hundred eighty-seven", and thus it is an aban number.