18743971 has 4 divisors (see below), whose sum is σ = 18764712. Its totient is φ = 18723232.

The previous prime is 18743969. The next prime is 18743999. The reversal of 18743971 is 17934781.

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

It is a cyclic number.

It is not a de Polignac number, because 18743971 - 2¹ = 18743969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18743951) 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, 8950 + ... + 10843.

It is an arithmetic number, because the mean of its divisors is an integer number (4691178).

Almost surely, 2^18743971 is an apocalyptic number.

18743971 is a deficient number, since it is larger than the sum of its proper divisors (20741).

18743971 is an equidigital number, since it uses as much as digits as its factorization.

18743971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20740.

The product of its digits is 42336, while the sum is 40.

The square root of 18743971 is about 4329.4307939959. The cubic root of 18743971 is about 265.6361647164.

The spelling of 18743971 in words is "eighteen million, seven hundred forty-three thousand, nine hundred seventy-one".