18434427 has 16 divisors (see below), whose sum is σ = 28225920. Its totient is φ = 10584000.

The previous prime is 18434417. The next prime is 18434483. The reversal of 18434427 is 72443481.

It is not a de Polignac number, because 18434427 - 2⁶ = 18434363 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (18434417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14074 + ... + 15327.

It is an arithmetic number, because the mean of its divisors is an integer number (1764120).

Almost surely, 2^18434427 is an apocalyptic number.

18434427 is a deficient number, since it is larger than the sum of its proper divisors (9791493).

18434427 is a wasteful number, since it uses less digits than its factorization.

18434427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29434.

The product of its digits is 21504, while the sum is 33.

The square root of 18434427 is about 4293.5331604635. The cubic root of 18434427 is about 264.1657734094.

The spelling of 18434427 in words is "eighteen million, four hundred thirty-four thousand, four hundred twenty-seven".