1981834 has 4 divisors (see below), whose sum is σ = 2972754. Its totient is φ = 990916.

The previous prime is 1981813. The next prime is 1981853. The reversal of 1981834 is 4381891.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1177225 + 804609 = 1085^2 + 897^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1981834.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495457 + ... + 495460.

2^1981834 is an apocalyptic number.

1981834 is a deficient number, since it is larger than the sum of its proper divisors (990920).

1981834 is an equidigital number, since it uses as much as digits as its factorization.

1981834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990919.

The product of its digits is 6912, while the sum is 34.

The square root of 1981834 is about 1407.7762606323. The cubic root of 1981834 is about 125.6094820894.

The spelling of 1981834 in words is "one million, nine hundred eighty-one thousand, eight hundred thirty-four".