18417139 has 4 divisors (see below), whose sum is σ = 19833856. Its totient is φ = 17000424.

The previous prime is 18417127. The next prime is 18417143. The reversal of 18417139 is 93171481.

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

It is a cyclic number.

It is not a de Polignac number, because 18417139 - 2⁷ = 18417011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18417149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 708339 + ... + 708364.

It is an arithmetic number, because the mean of its divisors is an integer number (4958464).

Almost surely, 2^18417139 is an apocalyptic number.

18417139 is a deficient number, since it is larger than the sum of its proper divisors (1416717).

18417139 is a wasteful number, since it uses less digits than its factorization.

18417139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416716.

The product of its digits is 6048, while the sum is 34.

The square root of 18417139 is about 4291.5194278950. The cubic root of 18417139 is about 264.0831684323.

The spelling of 18417139 in words is "eighteen million, four hundred seventeen thousand, one hundred thirty-nine".