989870887 has 2 divisors, whose sum is σ = 989870888. Its totient is φ = 989870886.

The previous prime is 989870863. The next prime is 989870897. The reversal of 989870887 is 788078989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989870887 - 2¹¹ = 989868839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989870837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494935443 + 494935444.

It is an arithmetic number, because the mean of its divisors is an integer number (494935444).

Almost surely, 2^989870887 is an apocalyptic number.

989870887 is a deficient number, since it is larger than the sum of its proper divisors (1).

989870887 is an equidigital number, since it uses as much as digits as its factorization.

989870887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16257024, while the sum is 64.

The square root of 989870887 is about 31462.2136379499. The cubic root of 989870887 is about 996.6121645321.

The spelling of 989870887 in words is "nine hundred eighty-nine million, eight hundred seventy thousand, eight hundred eighty-seven".