1840081 has 4 divisors (see below), whose sum is σ = 1847664. Its totient is φ = 1832500.

The previous prime is 1840073. The next prime is 1840087. The reversal of 1840081 is 1800481.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1800481 = 877 ⋅2053.

It is a cyclic number.

It is not a de Polignac number, because 1840081 - 2³ = 1840073 is a prime.

It is a super-2 number, since 2×1840081² = 6771796173122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1840087) 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, 3415 + ... + 3916.

It is an arithmetic number, because the mean of its divisors is an integer number (461916).

2^1840081 is an apocalyptic number.

It is an amenable number.

1840081 is a deficient number, since it is larger than the sum of its proper divisors (7583).

1840081 is an equidigital number, since it uses as much as digits as its factorization.

1840081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7582.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1840081 is about 1356.4958532926. The cubic root of 1840081 is about 122.5403115977.

It can be divided in two parts, 18400 and 81, that added together give a palindrome (18481).

The spelling of 1840081 in words is "one million, eight hundred forty thousand, eighty-one".