18834947 has 4 divisors (see below), whose sum is σ = 19826280. Its totient is φ = 17843616.

The previous prime is 18834931. The next prime is 18834967. The reversal of 18834947 is 74943881.

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 18834947 - 2⁴ = 18834931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18834898 and 18834907.

It is not an unprimeable number, because it can be changed into a prime (18834967) 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, 495638 + ... + 495675.

It is an arithmetic number, because the mean of its divisors is an integer number (4956570).

Almost surely, 2^18834947 is an apocalyptic number.

18834947 is a deficient number, since it is larger than the sum of its proper divisors (991333).

18834947 is an equidigital number, since it uses as much as digits as its factorization.

18834947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991332.

The product of its digits is 193536, while the sum is 44.

The square root of 18834947 is about 4339.9247689332. The cubic root of 18834947 is about 266.0652364162.

The spelling of 18834947 in words is "eighteen million, eight hundred thirty-four thousand, nine hundred forty-seven".