18374563 has 4 divisors (see below), whose sum is σ = 18451048. Its totient is φ = 18298080.

The previous prime is 18374561. The next prime is 18374567. The reversal of 18374563 is 36547381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36547381 = 13 ⋅2811337.

It is a cyclic number.

It is not a de Polignac number, because 18374563 - 2¹ = 18374561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18374561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37881 + ... + 38362.

It is an arithmetic number, because the mean of its divisors is an integer number (4612762).

Almost surely, 2^18374563 is an apocalyptic number.

18374563 is a deficient number, since it is larger than the sum of its proper divisors (76485).

18374563 is an equidigital number, since it uses as much as digits as its factorization.

18374563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76484.

The product of its digits is 60480, while the sum is 37.

The square root of 18374563 is about 4286.5560768524. The cubic root of 18374563 is about 263.8795124737.

It can be divided in two parts, 1837 and 4563, that added together give a square (6400 = 80²).

The spelling of 18374563 in words is "eighteen million, three hundred seventy-four thousand, five hundred sixty-three".