18440043 has 16 divisors (see below), whose sum is σ = 25816320. Its totient is φ = 11685344.

The previous prime is 18440039. The next prime is 18440047. The reversal of 18440043 is 34004481.

It is an interprime number because it is at equal distance from previous prime (18440039) and next prime (18440047).

It is a cyclic number.

It is not a de Polignac number, because 18440043 - 2² = 18440039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18439995 and 18440022.

It is not an unprimeable number, because it can be changed into a prime (18440047) 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, 11605 + ... + 13097.

It is an arithmetic number, because the mean of its divisors is an integer number (1613520).

Almost surely, 2^18440043 is an apocalyptic number.

18440043 is a deficient number, since it is larger than the sum of its proper divisors (7376277).

18440043 is a wasteful number, since it uses less digits than its factorization.

18440043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 18440043 is about 4294.1871174880. The cubic root of 18440043 is about 264.1925964899.

The spelling of 18440043 in words is "eighteen million, four hundred forty thousand, forty-three".