989738887 has 2 divisors, whose sum is σ = 989738888. Its totient is φ = 989738886.

The previous prime is 989738881. The next prime is 989738927. The reversal of 989738887 is 788837989.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989738887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989738881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494869443 + 494869444.

It is an arithmetic number, because the mean of its divisors is an integer number (494869444).

Almost surely, 2^989738887 is an apocalyptic number.

989738887 is a deficient number, since it is larger than the sum of its proper divisors (1).

989738887 is an equidigital number, since it uses as much as digits as its factorization.

989738887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48771072, while the sum is 67.

The square root of 989738887 is about 31460.1158135186. The cubic root of 989738887 is about 996.5678629114.

It can be divided in two parts, 9897 and 38887, that added together give a palindrome (48784).

The spelling of 989738887 in words is "nine hundred eighty-nine million, seven hundred thirty-eight thousand, eight hundred eighty-seven".