18434139 has 8 divisors (see below), whose sum is σ = 24982032. Its totient is φ = 12087840.

The previous prime is 18434113. The next prime is 18434153. The reversal of 18434139 is 93143481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18434139 - 2⁵ = 18434107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18434639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50184 + ... + 50549.

It is an arithmetic number, because the mean of its divisors is an integer number (3122754).

Almost surely, 2^18434139 is an apocalyptic number.

18434139 is a deficient number, since it is larger than the sum of its proper divisors (6547893).

18434139 is a wasteful number, since it uses less digits than its factorization.

18434139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100797.

The product of its digits is 10368, while the sum is 33.

The square root of 18434139 is about 4293.4996215209. The cubic root of 18434139 is about 264.1643977200.

The spelling of 18434139 in words is "eighteen million, four hundred thirty-four thousand, one hundred thirty-nine".