18139241 has 4 divisors (see below), whose sum is σ = 18148992. Its totient is φ = 18129492.

The previous prime is 18139237. The next prime is 18139267. The reversal of 18139241 is 14293181.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18139241 - 2² = 18139237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18139201) 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, 1121 + ... + 6126.

It is an arithmetic number, because the mean of its divisors is an integer number (4537248).

Almost surely, 2^18139241 is an apocalyptic number.

It is an amenable number.

18139241 is a deficient number, since it is larger than the sum of its proper divisors (9751).

18139241 is an equidigital number, since it uses as much as digits as its factorization.

18139241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9750.

The product of its digits is 1728, while the sum is 29.

The square root of 18139241 is about 4259.0187837106. The cubic root of 18139241 is about 262.7481722534.

The spelling of 18139241 in words is "eighteen million, one hundred thirty-nine thousand, two hundred forty-one".