18945142 has 4 divisors (see below), whose sum is σ = 28417716. Its totient is φ = 9472570.

The previous prime is 18945139. The next prime is 18945151. The reversal of 18945142 is 24154981.

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: 24154981 = 71 ⋅340211.

It is a junction number, because it is equal to n+sod(n) for n = 18945098 and 18945107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4736284 + ... + 4736287.

It is an arithmetic number, because the mean of its divisors is an integer number (7104429).

Almost surely, 2^18945142 is an apocalyptic number.

18945142 is a deficient number, since it is larger than the sum of its proper divisors (9472574).

18945142 is an equidigital number, since it uses as much as digits as its factorization.

18945142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9472573.

The product of its digits is 11520, while the sum is 34.

The square root of 18945142 is about 4352.6017506774. The cubic root of 18945142 is about 266.5831047208.

The spelling of 18945142 in words is "eighteen million, nine hundred forty-five thousand, one hundred forty-two".