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644383 is a prime number
BaseRepresentation
bin10011101010100011111
31012201221001
42131110133
5131110013
621451131
75322445
oct2352437
91181831
10644383
11400153
12270aa7
131973bc
1412ab95
15caddd
hex9d51f

644383 has 2 divisors, whose sum is σ = 644384. Its totient is φ = 644382.

The previous prime is 644381. The next prime is 644401. The reversal of 644383 is 383446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 644383 - 21 = 644381 is a prime.

Together with 644381, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322191 + 322192.

It is an arithmetic number, because the mean of its divisors is an integer number (322192).

2644383 is an apocalyptic number.

644383 is a deficient number, since it is larger than the sum of its proper divisors (1).

644383 is an equidigital number, since it uses as much as digits as its factorization.

644383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

The square root of 644383 is about 802.7347008819. The cubic root of 644383 is about 86.3736670294.

The spelling of 644383 in words is "six hundred forty-four thousand, three hundred eighty-three".