989894947 has 2 divisors, whose sum is σ = 989894948. Its totient is φ = 989894946.

The previous prime is 989894911. The next prime is 989894981. The reversal of 989894947 is 749498989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989894947 - 2¹⁹ = 989370659 is a prime.

It is a super-4 number, since 4×989894947⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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 (989894987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494947473 + 494947474.

It is an arithmetic number, because the mean of its divisors is an integer number (494947474).

Almost surely, 2^989894947 is an apocalyptic number.

989894947 is a deficient number, since it is larger than the sum of its proper divisors (1).

989894947 is an equidigital number, since it uses as much as digits as its factorization.

989894947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47029248, while the sum is 67.

The square root of 989894947 is about 31462.5959990589. The cubic root of 989894947 is about 996.6202390849.

The spelling of 989894947 in words is "nine hundred eighty-nine million, eight hundred ninety-four thousand, nine hundred forty-seven".