18139606 has 4 divisors (see below), whose sum is σ = 27209412. Its totient is φ = 9069802.

The previous prime is 18139601. The next prime is 18139613. The reversal of 18139606 is 60693181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18139601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4534900 + ... + 4534903.

It is an arithmetic number, because the mean of its divisors is an integer number (6802353).

Almost surely, 2^18139606 is an apocalyptic number.

18139606 is a deficient number, since it is larger than the sum of its proper divisors (9069806).

18139606 is an equidigital number, since it uses as much as digits as its factorization.

18139606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9069805.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 18139606 is about 4259.0616337405. The cubic root of 18139606 is about 262.7499345918.

The spelling of 18139606 in words is "eighteen million, one hundred thirty-nine thousand, six hundred six".