1840722985 has 4 divisors (see below), whose sum is σ = 2208867588. Its totient is φ = 1472578384.

The previous prime is 1840722971. The next prime is 1840723037. The reversal of 1840722985 is 5892270481.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1055210256 + 785512729 = 32484^2 + 28027^2 .

It is a cyclic number.

It is not a de Polignac number, because 1840722985 - 2⁹ = 1840722473 is a prime.

It is a super-2 number, since 2×1840722985² = 6776522215014620450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184072294 + ... + 184072303.

It is an arithmetic number, because the mean of its divisors is an integer number (552216897).

Almost surely, 2^1840722985 is an apocalyptic number.

It is an amenable number.

1840722985 is a deficient number, since it is larger than the sum of its proper divisors (368144603).

1840722985 is an equidigital number, since it uses as much as digits as its factorization.

1840722985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368144602.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 1840722985 is about 42903.6476887455. The cubic root of 1840722985 is about 1225.5456095133.

The spelling of 1840722985 in words is "one billion, eight hundred forty million, seven hundred twenty-two thousand, nine hundred eighty-five".