1820783109 has 16 divisors (see below), whose sum is σ = 2614984704. Its totient is φ = 1123623600.

The previous prime is 1820783051. The next prime is 1820783137. The reversal of 1820783109 is 9013870281.

It is not a de Polignac number, because 1820783109 - 2¹⁹ = 1820258821 is a prime.

It is a super-2 number, since 2×1820783109² = 6630502260039411762, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820783189) 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, 423477 + ... + 427754.

It is an arithmetic number, because the mean of its divisors is an integer number (163436544).

Almost surely, 2^1820783109 is an apocalyptic number.

It is an amenable number.

1820783109 is a deficient number, since it is larger than the sum of its proper divisors (794201595).

1820783109 is a wasteful number, since it uses less digits than its factorization.

1820783109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851288.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 1820783109 is about 42670.6352073648. The cubic root of 1820783109 is about 1221.1042383009.

The spelling of 1820783109 in words is "one billion, eight hundred twenty million, seven hundred eighty-three thousand, one hundred nine".