19782138 has 16 divisors (see below), whose sum is σ = 39655296. Its totient is φ = 6578880.

The previous prime is 19782127. The next prime is 19782143. The reversal of 19782138 is 83128791.

It is a junction number, because it is equal to n+sod(n) for n = 19782096 and 19782105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 783 + ... + 6338.

It is an arithmetic number, because the mean of its divisors is an integer number (2478456).

Almost surely, 2^19782138 is an apocalyptic number.

19782138 is an abundant number, since it is smaller than the sum of its proper divisors (19873158).

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

19782138 is a wasteful number, since it uses less digits than its factorization.

19782138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7589.

The product of its digits is 24192, while the sum is 39.

The square root of 19782138 is about 4447.7115464023. The cubic root of 19782138 is about 270.4525469608.

The spelling of 19782138 in words is "nineteen million, seven hundred eighty-two thousand, one hundred thirty-eight".