1843661 has 4 divisors (see below), whose sum is σ = 1854492. Its totient is φ = 1832832.

The previous prime is 1843649. The next prime is 1843687. The reversal of 1843661 is 1663481.

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

It can be written as a sum of positive squares in 2 ways, for example, as 855625 + 988036 = 925^2 + 994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1843661 - 2¹⁴ = 1827277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1843631) 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, 5156 + ... + 5501.

It is an arithmetic number, because the mean of its divisors is an integer number (463623).

2^1843661 is an apocalyptic number.

It is an amenable number.

1843661 is a deficient number, since it is larger than the sum of its proper divisors (10831).

1843661 is a wasteful number, since it uses less digits than its factorization.

1843661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10830.

The product of its digits is 3456, while the sum is 29.

The square root of 1843661 is about 1357.8147885481. The cubic root of 1843661 is about 122.6197302247.

The spelling of 1843661 in words is "one million, eight hundred forty-three thousand, six hundred sixty-one".