18434678 has 4 divisors (see below), whose sum is σ = 27652020. Its totient is φ = 9217338.

The previous prime is 18434671. The next prime is 18434687. The reversal of 18434678 is 87643481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87643481 = 29 ⋅3022189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18434671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4608668 + ... + 4608671.

It is an arithmetic number, because the mean of its divisors is an integer number (6913005).

Almost surely, 2^18434678 is an apocalyptic number.

18434678 is a deficient number, since it is larger than the sum of its proper divisors (9217342).

18434678 is an equidigital number, since it uses as much as digits as its factorization.

18434678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9217341.

The product of its digits is 129024, while the sum is 41.

The square root of 18434678 is about 4293.5623903700. The cubic root of 18434678 is about 264.1669723493.

The spelling of 18434678 in words is "eighteen million, four hundred thirty-four thousand, six hundred seventy-eight".