19812138 has 16 divisors (see below), whose sum is σ = 39694656. Its totient is φ = 6592320.

The previous prime is 19812113. The next prime is 19812179. The reversal of 19812138 is 83121891.

It is a super-3 number, since 3×19812138³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19812099 and 19812108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1170 + ... + 6402.

It is an arithmetic number, because the mean of its divisors is an integer number (2480916).

Almost surely, 2^19812138 is an apocalyptic number.

19812138 is an abundant number, since it is smaller than the sum of its proper divisors (19882518).

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

19812138 is a wasteful number, since it uses less digits than its factorization.

19812138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5869.

The product of its digits is 3456, while the sum is 33.

The square root of 19812138 is about 4451.0827896142. The cubic root of 19812138 is about 270.5891934378.

The spelling of 19812138 in words is "nineteen million, eight hundred twelve thousand, one hundred thirty-eight".