18138495 has 8 divisors (see below), whose sum is σ = 29021616. Its totient is φ = 9673856.

The previous prime is 18138493. The next prime is 18138499. The reversal of 18138495 is 59483181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18138495 - 2¹ = 18138493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604602 + ... + 604631.

It is an arithmetic number, because the mean of its divisors is an integer number (3627702).

Almost surely, 2^18138495 is an apocalyptic number.

18138495 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18138495 is a deficient number, since it is larger than the sum of its proper divisors (10883121).

18138495 is a wasteful number, since it uses less digits than its factorization.

18138495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209241.

The product of its digits is 34560, while the sum is 39.

The square root of 18138495 is about 4258.9312039525. The cubic root of 18138495 is about 262.7445702500.

The spelling of 18138495 in words is "eighteen million, one hundred thirty-eight thousand, four hundred ninety-five".