18161443 has 4 divisors (see below), whose sum is σ = 18747328. Its totient is φ = 17575560.

The previous prime is 18161441. The next prime is 18161449. The reversal of 18161443 is 34416181.

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

It is a cyclic number.

It is not a de Polignac number, because 18161443 - 2¹ = 18161441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18161441) 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, 292896 + ... + 292957.

It is an arithmetic number, because the mean of its divisors is an integer number (4686832).

Almost surely, 2^18161443 is an apocalyptic number.

18161443 is a deficient number, since it is larger than the sum of its proper divisors (585885).

18161443 is an equidigital number, since it uses as much as digits as its factorization.

18161443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585884.

The product of its digits is 2304, while the sum is 28.

The square root of 18161443 is about 4261.6244555334. The cubic root of 18161443 is about 262.8553277200.

The spelling of 18161443 in words is "eighteen million, one hundred sixty-one thousand, four hundred forty-three".