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1820019 = 3606673
BaseRepresentation
bin110111100010101110011
310102110121010
412330111303
5431220034
6103002003
721320115
oct6742563
93373533
101820019
111033453
12739303
134b9546
143553b5
1525e3e9
hex1bc573

1820019 has 4 divisors (see below), whose sum is σ = 2426696. Its totient is φ = 1213344.

The previous prime is 1820009. The next prime is 1820023. The reversal of 1820019 is 9100281.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1820019 - 27 = 1819891 is a prime.

It is a super-2 number, since 2×18200192 = 6624938320722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1819977 and 1820004.

It is not an unprimeable number, because it can be changed into a prime (1820009) 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 3 ways as a sum of consecutive naturals, for example, 303334 + ... + 303339.

It is an arithmetic number, because the mean of its divisors is an integer number (606674).

21820019 is an apocalyptic number.

1820019 is a deficient number, since it is larger than the sum of its proper divisors (606677).

1820019 is an equidigital number, since it uses as much as digits as its factorization.

1820019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606676.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1820019 is about 1349.0807981733. The cubic root of 1820019 is about 122.0933398387.

The spelling of 1820019 in words is "one million, eight hundred twenty thousand, nineteen".

Divisors: 1 3 606673 1820019