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1379209 = 1328161
BaseRepresentation
bin101010000101110001001
32121001220211
411100232021
5323113314
645321121
714503006
oct5205611
92531824
101379209
11862247
125661a1
13393a00
1427c8ad
151c39c4
hex150b89

1379209 has 6 divisors (see below), whose sum is σ = 1493646. Its totient is φ = 1272960.

The previous prime is 1379207. The next prime is 1379237. The reversal of 1379209 is 9029731.

It can be written as a sum of positive squares in 3 ways, for example, as 5625 + 1373584 = 75^2 + 1172^2 .

It is not a de Polignac number, because 1379209 - 21 = 1379207 is a prime.

It is a Duffinian number.

1379209 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1379201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3912 + ... + 4249.

It is an arithmetic number, because the mean of its divisors is an integer number (248941).

21379209 is an apocalyptic number.

It is an amenable number.

1379209 is a deficient number, since it is larger than the sum of its proper divisors (114437).

1379209 is an equidigital number, since it uses as much as digits as its factorization.

1379209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8187 (or 8174 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 1379209 is about 1174.3972922312. The cubic root of 1379209 is about 111.3123523716.

The spelling of 1379209 in words is "one million, three hundred seventy-nine thousand, two hundred nine".

Divisors: 1 13 169 8161 106093 1379209