16530538 has 8 divisors (see below), whose sum is σ = 24850980. Its totient is φ = 8246880.

The previous prime is 16530523. The next prime is 16530539. The reversal of 16530538 is 83503561.

It can be written as a sum of positive squares in 2 ways, for example, as 16459249 + 71289 = 4057^2 + 267^2 .

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

It is not an unprimeable number, because it can be changed into a prime (16530539) 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, 8043 + ... + 9886.

Almost surely, 2^16530538 is an apocalyptic number.

16530538 is a deficient number, since it is larger than the sum of its proper divisors (8320442).

16530538 is a wasteful number, since it uses less digits than its factorization.

16530538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18392.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 16530538 is about 4065.7764326141. The cubic root of 16530538 is about 254.7391308853.

It can be divided in two parts, 165 and 30538, that added together give a palindrome (30703).

The spelling of 16530538 in words is "sixteen million, five hundred thirty thousand, five hundred thirty-eight".