18742641 has 4 divisors (see below), whose sum is σ = 24990192. Its totient is φ = 12495092.

The previous prime is 18742627. The next prime is 18742643. The reversal of 18742641 is 14624781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18742641 - 2¹⁰ = 18741617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18742643) 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, 3123771 + ... + 3123776.

It is an arithmetic number, because the mean of its divisors is an integer number (6247548).

Almost surely, 2^18742641 is an apocalyptic number.

It is an amenable number.

18742641 is a deficient number, since it is larger than the sum of its proper divisors (6247551).

18742641 is an equidigital number, since it uses as much as digits as its factorization.

18742641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6247550.

The product of its digits is 10752, while the sum is 33.

The square root of 18742641 is about 4329.2771914027. The cubic root of 18742641 is about 265.6298817280.

The spelling of 18742641 in words is "eighteen million, seven hundred forty-two thousand, six hundred forty-one".