18139361 has 8 divisors (see below), whose sum is σ = 18768960. Its totient is φ = 17517168.

The previous prime is 18139307. The next prime is 18139367. The reversal of 18139361 is 16393181.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18139361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18139367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3380 + ... + 6906.

It is an arithmetic number, because the mean of its divisors is an integer number (2346120).

Almost surely, 2^18139361 is an apocalyptic number.

It is an amenable number.

18139361 is a deficient number, since it is larger than the sum of its proper divisors (629599).

18139361 is a wasteful number, since it uses less digits than its factorization.

18139361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703.

The product of its digits is 3888, while the sum is 32.

The square root of 18139361 is about 4259.0328714392. The cubic root of 18139361 is about 262.7487516549.

The spelling of 18139361 in words is "eighteen million, one hundred thirty-nine thousand, three hundred sixty-one".