16812138 has 32 divisors (see below), whose sum is σ = 38549376. Its totient is φ = 4788288.

The previous prime is 16812127. The next prime is 16812139. The reversal of 16812138 is 83121861.

It is not an unprimeable number, because it can be changed into a prime (16812139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25420 + ... + 26072.

It is an arithmetic number, because the mean of its divisors is an integer number (1204668).

Almost surely, 2^16812138 is an apocalyptic number.

16812138 is an abundant number, since it is smaller than the sum of its proper divisors (21737238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16812138 is a wasteful number, since it uses less digits than its factorization.

16812138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278.

The product of its digits is 2304, while the sum is 30.

The square root of 16812138 is about 4100.2607234175. The cubic root of 16812138 is about 256.1774993783.

Adding to 16812138 its reverse (83121861), we get a palindrome (99933999).

It can be divided in two parts, 168 and 12138, that multiplied together give a square (2039184 = 1428²).

The spelling of 16812138 in words is "sixteen million, eight hundred twelve thousand, one hundred thirty-eight".