1836981 has 12 divisors (see below), whose sum is σ = 2665260. Its totient is φ = 1219200.

The previous prime is 1836979. The next prime is 1837007. The reversal of 1836981 is 1896381.

It can be written as a sum of positive squares in 2 ways, for example, as 1703025 + 133956 = 1305^2 + 366^2 .

It is not a de Polignac number, because 1836981 - 2¹ = 1836979 is a prime.

It is a super-2 number, since 2×1836981² = 6748998388722, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1836911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3355 + ... + 3863.

It is an arithmetic number, because the mean of its divisors is an integer number (222105).

2^1836981 is an apocalyptic number.

It is an amenable number.

1836981 is a deficient number, since it is larger than the sum of its proper divisors (828279).

1836981 is a wasteful number, since it uses less digits than its factorization.

1836981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 913 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1836981 is about 1355.3527216190. The cubic root of 1836981 is about 122.4714580179.

The spelling of 1836981 in words is "one million, eight hundred thirty-six thousand, nine hundred eighty-one".