18840343 has 16 divisors (see below), whose sum is σ = 21196800. Its totient is φ = 16662240.

The previous prime is 18840331. The next prime is 18840359. The reversal of 18840343 is 34304881.

It is a de Polignac number, because none of the positive numbers 2^k-18840343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18840383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16530 + ... + 17632.

It is an arithmetic number, because the mean of its divisors is an integer number (1324800).

Almost surely, 2^18840343 is an apocalyptic number.

18840343 is a deficient number, since it is larger than the sum of its proper divisors (2356457).

18840343 is a wasteful number, since it uses less digits than its factorization.

18840343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 18840343 is about 4340.5463941767. The cubic root of 18840343 is about 266.0906422206.

18840343 divided by its sum of digits (31) gives a triangular number (607753 = T₁₁₀₂).

The spelling of 18840343 in words is "eighteen million, eight hundred forty thousand, three hundred forty-three".