18625139 has 4 divisors (see below), whose sum is σ = 20057856. Its totient is φ = 17192424.

The previous prime is 18625121. The next prime is 18625153. The reversal of 18625139 is 93152681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93152681 = 59 ⋅1578859.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18625139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18625099 and 18625108.

It is not an unprimeable number, because it can be changed into a prime (18625109) 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, 716339 + ... + 716364.

It is an arithmetic number, because the mean of its divisors is an integer number (5014464).

Almost surely, 2^18625139 is an apocalyptic number.

18625139 is a deficient number, since it is larger than the sum of its proper divisors (1432717).

18625139 is a wasteful number, since it uses less digits than its factorization.

18625139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432716.

The product of its digits is 12960, while the sum is 35.

The square root of 18625139 is about 4315.6852294856. The cubic root of 18625139 is about 265.0736190383.

The spelling of 18625139 in words is "eighteen million, six hundred twenty-five thousand, one hundred thirty-nine".