1243055984 has 20 divisors (see below), whose sum is σ = 2413059840. Its totient is φ = 620330880.
The previous prime is 1243055941. The next prime is 1243056043. The reversal of 1243055984 is 4895503421.
It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66224 + ... + 82895.
It is an arithmetic number, because the mean of its divisors is an integer number (120652992).
Almost surely, 21243055984 is an apocalyptic number.
It is an amenable number.
1243055984 is a deficient number, since it is larger than the sum of its proper divisors (1170003856).
1243055984 is a wasteful number, since it uses less digits than its factorization.
1243055984 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 149648 (or 149642 counting only the distinct ones).
The product of its (nonzero) digits is 172800, while the sum is 41.
The square root of 1243055984 is about 35256.9990781972. Note that the first 3 decimals coincide. The cubic root of 1243055984 is about 1075.2189160076.
The spelling of 1243055984 in words is "one billion, two hundred forty-three million, fifty-five thousand, nine hundred eighty-four".
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