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1082809 = 71373163
BaseRepresentation
bin100001000010110111001
32001000100001
410020112321
5234122214
635113001
712126610
oct4102671
92030301
101082809
1167a592
12442761
132bbb20
14202877
15165c74
hex1085b9

1082809 has 16 divisors (see below), whose sum is σ = 1359232. Its totient is φ = 839808.

The previous prime is 1082801. The next prime is 1082881. The reversal of 1082809 is 9082801.

1082809 = 813 + 823.

It is a 3-Lehmer number, since φ(1082809) divides (1082809-1)3.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 1082809 - 23 = 1082801 is a prime.

It is a deceptive number, since it divides R1082808.

It is not an unprimeable number, because it can be changed into a prime (1082801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6562 + ... + 6724.

It is an arithmetic number, because the mean of its divisors is an integer number (84952).

It is a Poulet number, since it divides 21082808-1.

21082809 is an apocalyptic number.

It is an amenable number.

1082809 is a deficient number, since it is larger than the sum of its proper divisors (276423).

1082809 is a wasteful number, since it uses less digits than its factorization.

1082809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1082809 is about 1040.5810876621. The cubic root of 1082809 is about 102.6874302095.

It can be divided in two parts, 1082 and 809, that added together give a triangular number (1891 = T61).

The spelling of 1082809 in words is "one million, eighty-two thousand, eight hundred nine".

Divisors: 1 7 13 73 91 163 511 949 1141 2119 6643 11899 14833 83293 154687 1082809