1981746 has 40 divisors (see below), whose sum is σ = 4787244. Its totient is φ = 609120.

The previous prime is 1981739. The next prime is 1981753. The reversal of 1981746 is 6471891.

It is an interprime number because it is at equal distance from previous prime (1981739) and next prime (1981753).

It can be written as a sum of positive squares in 2 ways, for example, as 1946025 + 35721 = 1395^2 + 189^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1981746.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1636 + ... + 2576.

2^1981746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1981746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2393622).

1981746 is an abundant number, since it is smaller than the sum of its proper divisors (2805498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1981746 is a wasteful number, since it uses less digits than its factorization.

1981746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968 (or 959 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1981746 is about 1407.7450053188. The cubic root of 1981746 is about 125.6076229027.

The spelling of 1981746 in words is "one million, nine hundred eighty-one thousand, seven hundred forty-six".