18941573 has 4 divisors (see below), whose sum is σ = 21647520. Its totient is φ = 16235628.

The previous prime is 18941567. The next prime is 18941623. The reversal of 18941573 is 37514981.

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: 37514981 = 7 ⋅5359283.

It is a cyclic number.

It is not a de Polignac number, because 18941573 - 2⁸ = 18941317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18941563) 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, 1352963 + ... + 1352976.

It is an arithmetic number, because the mean of its divisors is an integer number (5411880).

Almost surely, 2^18941573 is an apocalyptic number.

It is an amenable number.

18941573 is a deficient number, since it is larger than the sum of its proper divisors (2705947).

18941573 is an equidigital number, since it uses as much as digits as its factorization.

18941573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705946.

The product of its digits is 30240, while the sum is 38.

The square root of 18941573 is about 4352.1917466950. The cubic root of 18941573 is about 266.5663634923.

The spelling of 18941573 in words is "eighteen million, nine hundred forty-one thousand, five hundred seventy-three".