18678734 has 4 divisors (see below), whose sum is σ = 28018104. Its totient is φ = 9339366.

The previous prime is 18678731. The next prime is 18678743. The reversal of 18678734 is 43787681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43787681 = 7 ⋅6255383.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18678731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4669682 + ... + 4669685.

It is an arithmetic number, because the mean of its divisors is an integer number (7004526).

Almost surely, 2^18678734 is an apocalyptic number.

18678734 is a deficient number, since it is larger than the sum of its proper divisors (9339370).

18678734 is an equidigital number, since it uses as much as digits as its factorization.

18678734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9339369.

The product of its digits is 225792, while the sum is 44.

The square root of 18678734 is about 4321.8900957799. The cubic root of 18678734 is about 265.3276308436.

It can be divided in two parts, 1867 and 8734, that added together give a palindrome (10601).

The spelling of 18678734 in words is "eighteen million, six hundred seventy-eight thousand, seven hundred thirty-four".