989898739 has 2 divisors, whose sum is σ = 989898740. Its totient is φ = 989898738.

The previous prime is 989898713. The next prime is 989898781. The reversal of 989898739 is 937898989.

It is a weak prime.

It is an emirp because it is prime and its reverse (937898989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989898739 - 2²¹ = 987801587 is a prime.

It is not a weakly prime, because it can be changed into another prime (989898709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494949369 + 494949370.

It is an arithmetic number, because the mean of its divisors is an integer number (494949370).

Almost surely, 2^989898739 is an apocalyptic number.

989898739 is a deficient number, since it is larger than the sum of its proper divisors (1).

989898739 is an equidigital number, since it uses as much as digits as its factorization.

989898739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70543872, while the sum is 70.

The square root of 989898739 is about 31462.6562610343. The cubic root of 989898739 is about 996.6215116708.

The spelling of 989898739 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, seven hundred thirty-nine".