989838947 has 2 divisors, whose sum is σ = 989838948. Its totient is φ = 989838946.

The previous prime is 989838943. The next prime is 989839051. The reversal of 989838947 is 749838989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989838947 - 2² = 989838943 is a prime.

It is a super-2 number, since 2×989838947² = 1959562281996137618, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (989838943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494919473 + 494919474.

It is an arithmetic number, because the mean of its divisors is an integer number (494919474).

Almost surely, 2^989838947 is an apocalyptic number.

989838947 is a deficient number, since it is larger than the sum of its proper divisors (1).

989838947 is an equidigital number, since it uses as much as digits as its factorization.

989838947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 65.

The square root of 989838947 is about 31461.7060408364. The cubic root of 989838947 is about 996.6014452435.

The spelling of 989838947 in words is "nine hundred eighty-nine million, eight hundred thirty-eight thousand, nine hundred forty-seven".