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989898921 = 331116691997
BaseRepresentation
bin111011000000001…
…010100010101001
32112222200002001000
4323000022202221
54011403231141
6242120545213
733350000454
oct7300124251
92488602030
10989898921
11468854790
12237622209
1312a11160b
149567c49b
155bd885b6
hex3b00a8a9

989898921 has 32 divisors (see below), whose sum is σ = 1601596800. Its totient is φ = 599279040.

The previous prime is 989898887. The next prime is 989898929. The reversal of 989898921 is 129898989.

It is not a de Polignac number, because 989898921 - 26 = 989898857 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (989898929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 494695 + ... + 496691.

It is an arithmetic number, because the mean of its divisors is an integer number (50049900).

Almost surely, 2989898921 is an apocalyptic number.

It is an amenable number.

989898921 is a deficient number, since it is larger than the sum of its proper divisors (611697879).

989898921 is a wasteful number, since it uses less digits than its factorization.

989898921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686 (or 3680 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 63.

The square root of 989898921 is about 31462.6591533519. The cubic root of 989898921 is about 996.6215727495.

The spelling of 989898921 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred twenty-one".

Divisors: 1 3 9 11 27 33 99 297 1669 1997 5007 5991 15021 17973 18359 21967 45063 53919 55077 65901 165231 197703 495693 593109 3332993 9998979 29996937 36662923 89990811 109988769 329966307 989898921