18549742 has 4 divisors (see below), whose sum is σ = 27824616. Its totient is φ = 9274870.

The previous prime is 18549721. The next prime is 18549743. The reversal of 18549742 is 24794581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24794581 = 7 ⋅3542083.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18549695 and 18549704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18549743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4637434 + ... + 4637437.

It is an arithmetic number, because the mean of its divisors is an integer number (6956154).

Almost surely, 2^18549742 is an apocalyptic number.

18549742 is a deficient number, since it is larger than the sum of its proper divisors (9274874).

18549742 is an equidigital number, since it uses as much as digits as its factorization.

18549742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9274873.

The product of its digits is 80640, while the sum is 40.

The square root of 18549742 is about 4306.9411419243. The cubic root of 18549742 is about 264.7154510664.

It can be divided in two parts, 18549 and 742, that added together give a palindrome (19291).

The spelling of 18549742 in words is "eighteen million, five hundred forty-nine thousand, seven hundred forty-two".