18139311 has 12 divisors (see below), whose sum is σ = 26238888. Its totient is φ = 12075504.

The previous prime is 18139307. The next prime is 18139367. The reversal of 18139311 is 11393181.

It is a happy number.

It is not a de Polignac number, because 18139311 - 2² = 18139307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18139411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9601 + ... + 11333.

It is an arithmetic number, because the mean of its divisors is an integer number (2186574).

Almost surely, 2^18139311 is an apocalyptic number.

18139311 is a deficient number, since it is larger than the sum of its proper divisors (8099577).

18139311 is a wasteful number, since it uses less digits than its factorization.

18139311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902 (or 2899 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 18139311 is about 4259.0270015580. The cubic root of 18139311 is about 262.7485102379.

The spelling of 18139311 in words is "eighteen million, one hundred thirty-nine thousand, three hundred eleven".