18843073 has 4 divisors (see below), whose sum is σ = 19281328. Its totient is φ = 18404820.

The previous prime is 18843061. The next prime is 18843091. The reversal of 18843073 is 37034881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37034881 = 13 ⋅2848837.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18843073 is a prime.

It is a super-2 number, since 2×18843073² = 710122800166658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18843023) 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, 219063 + ... + 219148.

It is an arithmetic number, because the mean of its divisors is an integer number (4820332).

Almost surely, 2^18843073 is an apocalyptic number.

It is an amenable number.

18843073 is a deficient number, since it is larger than the sum of its proper divisors (438255).

18843073 is an equidigital number, since it uses as much as digits as its factorization.

18843073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438254.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 18843073 is about 4340.8608593227. The cubic root of 18843073 is about 266.1034939393.

The spelling of 18843073 in words is "eighteen million, eight hundred forty-three thousand, seventy-three".