19863138 has 16 divisors (see below), whose sum is σ = 40113216. Its totient is φ = 6556560.

The previous prime is 19863133. The next prime is 19863139. The reversal of 19863138 is 83136891.

It is a junction number, because it is equal to n+sod(n) for n = 19863096 and 19863105.

It is not an unprimeable number, because it can be changed into a prime (19863133) 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, 15453 + ... + 16688.

It is an arithmetic number, because the mean of its divisors is an integer number (2507076).

Almost surely, 2^19863138 is an apocalyptic number.

19863138 is an abundant number, since it is smaller than the sum of its proper divisors (20250078).

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

19863138 is a wasteful number, since it uses less digits than its factorization.

19863138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32249.

The product of its digits is 31104, while the sum is 39.

The square root of 19863138 is about 4456.8080506120. The cubic root of 19863138 is about 270.8211762170.

It can be divided in two parts, 198 and 63138, that added together give a palindrome (63336).

The spelling of 19863138 in words is "nineteen million, eight hundred sixty-three thousand, one hundred thirty-eight".