18670139 has 4 divisors (see below), whose sum is σ = 19067424. Its totient is φ = 18272856.

The previous prime is 18670123. The next prime is 18670177. The reversal of 18670139 is 93107681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93107681 = 97 ⋅959873.

It is a cyclic number.

It is not a de Polignac number, because 18670139 - 2⁴ = 18670123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18670099 and 18670108.

It is not an unprimeable number, because it can be changed into a prime (18670439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198572 + ... + 198665.

It is an arithmetic number, because the mean of its divisors is an integer number (4766856).

Almost surely, 2^18670139 is an apocalyptic number.

18670139 is a deficient number, since it is larger than the sum of its proper divisors (397285).

18670139 is an equidigital number, since it uses as much as digits as its factorization.

18670139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397284.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 18670139 is about 4320.8956247519. The cubic root of 18670139 is about 265.2869278554.

The spelling of 18670139 in words is "eighteen million, six hundred seventy thousand, one hundred thirty-nine".