19381938 has 64 divisors (see below), whose sum is σ = 44115840. Its totient is φ = 5640192.

The previous prime is 19381931. The next prime is 19381963. The reversal of 19381938 is 83918391.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19381938.

It is not an unprimeable number, because it can be changed into a prime (19381931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141406 + ... + 141542.

It is an arithmetic number, because the mean of its divisors is an integer number (689310).

Almost surely, 2^19381938 is an apocalyptic number.

19381938 is an abundant number, since it is smaller than the sum of its proper divisors (24733902).

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

19381938 is a wasteful number, since it uses less digits than its factorization.

19381938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251.

The product of its digits is 46656, while the sum is 42.

The square root of 19381938 is about 4402.4922487155. The cubic root of 19381938 is about 268.6163230637.

The spelling of 19381938 in words is "nineteen million, three hundred eighty-one thousand, nine hundred thirty-eight".