18742291 has 4 divisors (see below), whose sum is σ = 18775800. Its totient is φ = 18708784.

The previous prime is 18742277. The next prime is 18742307. The reversal of 18742291 is 19224781.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18742291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18742201) 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, 15901 + ... + 17038.

It is an arithmetic number, because the mean of its divisors is an integer number (4693950).

Almost surely, 2^18742291 is an apocalyptic number.

18742291 is a deficient number, since it is larger than the sum of its proper divisors (33509).

18742291 is an equidigital number, since it uses as much as digits as its factorization.

18742291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33508.

The product of its digits is 8064, while the sum is 34.

The square root of 18742291 is about 4329.2367687619. The cubic root of 18742291 is about 265.6282282606.

The spelling of 18742291 in words is "eighteen million, seven hundred forty-two thousand, two hundred ninety-one".