1836642349 has 4 divisors (see below), whose sum is σ = 1837190236. Its totient is φ = 1836094464.

The previous prime is 1836642319. The next prime is 1836642361. The reversal of 1836642349 is 9432466381.

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 1334075625 + 502566724 = 36525^2 + 22418^2 .

It is a cyclic number.

It is not a de Polignac number, because 1836642349 - 2⁷ = 1836642221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1836642299 and 1836642308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1836642319) by changing a digit.

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, 268884 + ... + 275629.

It is an arithmetic number, because the mean of its divisors is an integer number (459297559).

Almost surely, 2^1836642349 is an apocalyptic number.

It is an amenable number.

1836642349 is a deficient number, since it is larger than the sum of its proper divisors (547887).

1836642349 is an equidigital number, since it uses as much as digits as its factorization.

1836642349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547886.

The product of its digits is 746496, while the sum is 46.

The square root of 1836642349 is about 42856.0654866963. The cubic root of 1836642349 is about 1224.6393160529.

The spelling of 1836642349 in words is "one billion, eight hundred thirty-six million, six hundred forty-two thousand, three hundred forty-nine".