19888238 has 16 divisors (see below), whose sum is σ = 31795200. Its totient is φ = 9308376.

The previous prime is 19888237. The next prime is 19888243. The reversal of 19888238 is 83288891.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a junction number, because it is equal to n+sod(n) for n = 19888192 and 19888201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19888237) 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, 2438 + ... + 6761.

It is an arithmetic number, because the mean of its divisors is an integer number (1987200).

Almost surely, 2^19888238 is an apocalyptic number.

19888238 is a deficient number, since it is larger than the sum of its proper divisors (11906962).

19888238 is a wasteful number, since it uses less digits than its factorization.

19888238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9271.

The product of its digits is 221184, while the sum is 47.

The square root of 19888238 is about 4459.6230782433. The cubic root of 19888238 is about 270.9352023470.

The spelling of 19888238 in words is "nineteen million, eight hundred eighty-eight thousand, two hundred thirty-eight".