18427742 has 4 divisors (see below), whose sum is σ = 27641616. Its totient is φ = 9213870.

The previous prime is 18427741. The next prime is 18427751. The reversal of 18427742 is 24772481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24772481 = 353 ⋅70177.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18427741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4606934 + ... + 4606937.

It is an arithmetic number, because the mean of its divisors is an integer number (6910404).

Almost surely, 2^18427742 is an apocalyptic number.

18427742 is a deficient number, since it is larger than the sum of its proper divisors (9213874).

18427742 is an equidigital number, since it uses as much as digits as its factorization.

18427742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9213873.

The product of its digits is 25088, while the sum is 35.

The square root of 18427742 is about 4292.7545934982. The cubic root of 18427742 is about 264.1338374796.

The spelling of 18427742 in words is "eighteen million, four hundred twenty-seven thousand, seven hundred forty-two".