1836561 has 8 divisors (see below), whose sum is σ = 2592864. Its totient is φ = 1152320.

The previous prime is 1836553. The next prime is 1836563. The reversal of 1836561 is 1656381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1836561 - 2³ = 1836553 is a prime.

It is an alternating number because its digits alternate between odd and even.

1836561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1836563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17955 + ... + 18056.

It is an arithmetic number, because the mean of its divisors is an integer number (324108).

2^1836561 is an apocalyptic number.

It is an amenable number.

1836561 is a deficient number, since it is larger than the sum of its proper divisors (756303).

1836561 is a wasteful number, since it uses less digits than its factorization.

1836561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36031.

The product of its digits is 4320, while the sum is 30.

The square root of 1836561 is about 1355.1977715448. The cubic root of 1836561 is about 122.4621235114.

The spelling of 1836561 in words is "one million, eight hundred thirty-six thousand, five hundred sixty-one".