989870039 has 2 divisors, whose sum is σ = 989870040. Its totient is φ = 989870038.

The previous prime is 989870023. The next prime is 989870041. The reversal of 989870039 is 930078989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989870039 - 2⁴ = 989870023 is a prime.

Together with 989870041, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989870009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494935019 + 494935020.

It is an arithmetic number, because the mean of its divisors is an integer number (494935020).

Almost surely, 2^989870039 is an apocalyptic number.

989870039 is a deficient number, since it is larger than the sum of its proper divisors (1).

989870039 is an equidigital number, since it uses as much as digits as its factorization.

989870039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 989870039 is about 31462.2001614636. The cubic root of 989870039 is about 996.6118799403.

The spelling of 989870039 in words is "nine hundred eighty-nine million, eight hundred seventy thousand, thirty-nine".