1816939 has 4 divisors (see below), whose sum is σ = 1819656. Its totient is φ = 1814224.

The previous prime is 1816933. The next prime is 1816949. The reversal of 1816939 is 9396181.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1816939 - 2¹⁵ = 1784171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1816898 and 1816907.

It is not an unprimeable number, because it can be changed into a prime (1816933) 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, 432 + ... + 1954.

It is an arithmetic number, because the mean of its divisors is an integer number (454914).

2^1816939 is an apocalyptic number.

1816939 is a deficient number, since it is larger than the sum of its proper divisors (2717).

1816939 is a wasteful number, since it uses less digits than its factorization.

1816939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716.

The product of its digits is 11664, while the sum is 37.

The square root of 1816939 is about 1347.9387968302. The cubic root of 1816939 is about 122.0244285043.

The spelling of 1816939 in words is "one million, eight hundred sixteen thousand, nine hundred thirty-nine".