19938105 has 48 divisors (see below), whose sum is σ = 38548224. Its totient is φ = 9450240.

The previous prime is 19938103. The next prime is 19938119. The reversal of 19938105 is 50183991.

It is a happy number.

It is not a de Polignac number, because 19938105 - 2¹ = 19938103 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19938105.

It is not an unprimeable number, because it can be changed into a prime (19938103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22837 + ... + 23693.

It is an arithmetic number, because the mean of its divisors is an integer number (803088).

Almost surely, 2^19938105 is an apocalyptic number.

19938105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19938105 is a deficient number, since it is larger than the sum of its proper divisors (18610119).

19938105 is a wasteful number, since it uses less digits than its factorization.

19938105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 923 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 19938105 is about 4465.2105213528. The cubic root of 19938105 is about 271.1614575059.

The spelling of 19938105 in words is "nineteen million, nine hundred thirty-eight thousand, one hundred five".