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648939 = 31991087
BaseRepresentation
bin10011110011011101011
31012222011210
42132123223
5131231224
621524203
75341644
oct2363353
91188153
10648939
11403615
12273663
131994b5
1412c6cb
15cc429
hex9e6eb

648939 has 8 divisors (see below), whose sum is σ = 870400. Its totient is φ = 430056.

The previous prime is 648937. The next prime is 648953. The reversal of 648939 is 939846.

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

It is not a de Polignac number, because 648939 - 21 = 648937 is a prime.

It is a super-2 number, since 2×6489392 = 842243651442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648897 and 648906.

It is not an unprimeable number, because it can be changed into a prime (648931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54 + ... + 1140.

It is an arithmetic number, because the mean of its divisors is an integer number (108800).

2648939 is an apocalyptic number.

648939 is a deficient number, since it is larger than the sum of its proper divisors (221461).

648939 is a wasteful number, since it uses less digits than its factorization.

648939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289.

The product of its digits is 46656, while the sum is 39.

The square root of 648939 is about 805.5675018271. The cubic root of 648939 is about 86.5767525742.

The spelling of 648939 in words is "six hundred forty-eight thousand, nine hundred thirty-nine".

Divisors: 1 3 199 597 1087 3261 216313 648939