19500138 has 36 divisors (see below), whose sum is σ = 49150530. Its totient is φ = 5571216.

The previous prime is 19500127. The next prime is 19500157. The reversal of 19500138 is 83100591.

It can be written as a sum of positive squares in only one way, i.e., 18896409 + 603729 = 4347^2 + 777^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10173 + ... + 11936.

Almost surely, 2^19500138 is an apocalyptic number.

19500138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19500138 is an abundant number, since it is smaller than the sum of its proper divisors (29650392).

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

19500138 is a wasteful number, since it uses less digits than its factorization.

19500138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22131 (or 22121 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 19500138 is about 4415.8960585593. The cubic root of 19500138 is about 269.1612655459.

The spelling of 19500138 in words is "nineteen million, five hundred thousand, one hundred thirty-eight".