18139467 has 4 divisors (see below), whose sum is σ = 24185960. Its totient is φ = 12092976.

The previous prime is 18139463. The next prime is 18139481. The reversal of 18139467 is 76493181.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18139467 - 2² = 18139463 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18139463) 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 3 ways as a sum of consecutive naturals, for example, 3023242 + ... + 3023247.

It is an arithmetic number, because the mean of its divisors is an integer number (6046490).

Almost surely, 2^18139467 is an apocalyptic number.

18139467 is a deficient number, since it is larger than the sum of its proper divisors (6046493).

18139467 is an equidigital number, since it uses as much as digits as its factorization.

18139467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6046492.

The product of its digits is 36288, while the sum is 39.

The square root of 18139467 is about 4259.0453155608. The cubic root of 18139467 is about 262.7492634575.

The spelling of 18139467 in words is "eighteen million, one hundred thirty-nine thousand, four hundred sixty-seven".