18725135 has 16 divisors (see below), whose sum is σ = 26399520. Its totient is φ = 12570240.

The previous prime is 18725131. The next prime is 18725137. The reversal of 18725135 is 53152781.

It is not a de Polignac number, because 18725135 - 2² = 18725131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18725131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12380 + ... + 13809.

It is an arithmetic number, because the mean of its divisors is an integer number (1649970).

Almost surely, 2^18725135 is an apocalyptic number.

18725135 is a deficient number, since it is larger than the sum of its proper divisors (7674385).

18725135 is a wasteful number, since it uses less digits than its factorization.

18725135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26218.

The product of its digits is 8400, while the sum is 32.

The square root of 18725135 is about 4327.2549035156. The cubic root of 18725135 is about 265.5471547664.

It can be divided in two parts, 1872 and 5135, that added together give a palindrome (7007).

The spelling of 18725135 in words is "eighteen million, seven hundred twenty-five thousand, one hundred thirty-five".