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8712985 = 51939029
BaseRepresentation
bin100001001111…
…001100011001
3121101122222011
4201033030121
54212303420
6510425521
7134026201
oct41171431
917348864
108712985
114a11216
122b022a1
131a60b18
14122b401
15b7195a
hex84f319

8712985 has 8 divisors (see below), whose sum is σ = 10510920. Its totient is φ = 6933504.

The previous prime is 8712973. The next prime is 8712997. The reversal of 8712985 is 5892178.

It is an interprime number because it is at equal distance from previous prime (8712973) and next prime (8712997).

It can be written as a sum of positive squares in 4 ways, for example, as 2442969 + 6270016 = 1563^2 + 2504^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-8712985 is a prime.

It is a super-2 number, since 2×87129852 = 151832215220450, which contains 22 as substring.

8712985 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a Zeisel number, with parameters (47, -42).

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3550 + ... + 5479.

It is an arithmetic number, because the mean of its divisors is an integer number (1313865).

Almost surely, 28712985 is an apocalyptic number.

It is an amenable number.

8712985 is a deficient number, since it is larger than the sum of its proper divisors (1797935).

8712985 is a wasteful number, since it uses less digits than its factorization.

8712985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9227.

The product of its digits is 40320, while the sum is 40.

The square root of 8712985 is about 2951.7765836865. The cubic root of 8712985 is about 205.7732840543.

The spelling of 8712985 in words is "eight million, seven hundred twelve thousand, nine hundred eighty-five".

Divisors: 1 5 193 965 9029 45145 1742597 8712985