1836181 has 4 divisors (see below), whose sum is σ = 1854112. Its totient is φ = 1818252.

The previous prime is 1836157. The next prime is 1836239. The reversal of 1836181 is 1816381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1836181 - 2⁷ = 1836053 is a prime.

It is a super-2 number, since 2×1836181² = 6743121329522, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1836151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8811 + ... + 9016.

It is an arithmetic number, because the mean of its divisors is an integer number (463528).

2^1836181 is an apocalyptic number.

It is an amenable number.

1836181 is a deficient number, since it is larger than the sum of its proper divisors (17931).

1836181 is a wasteful number, since it uses less digits than its factorization.

1836181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17930.

The product of its digits is 1152, while the sum is 28.

The square root of 1836181 is about 1355.0575633529. The cubic root of 1836181 is about 122.4536767792.

The spelling of 1836181 in words is "one million, eight hundred thirty-six thousand, one hundred eighty-one".