18138413 has 4 divisors (see below), whose sum is σ = 18154080. Its totient is φ = 18122748.

The previous prime is 18138409. The next prime is 18138437. The reversal of 18138413 is 31483181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18138413 - 2² = 18138409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138443) 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, 5945 + ... + 8462.

It is an arithmetic number, because the mean of its divisors is an integer number (4538520).

Almost surely, 2^18138413 is an apocalyptic number.

It is an amenable number.

18138413 is a deficient number, since it is larger than the sum of its proper divisors (15667).

18138413 is a wasteful number, since it uses less digits than its factorization.

18138413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15666.

The product of its digits is 2304, while the sum is 29.

The square root of 18138413 is about 4258.9215771132. The cubic root of 18138413 is about 262.7441743133.

The spelling of 18138413 in words is "eighteen million, one hundred thirty-eight thousand, four hundred thirteen".