19557138 has 16 divisors (see below), whose sum is σ = 39650976. Its totient is φ = 6429600.

The previous prime is 19557133. The next prime is 19557151. The reversal of 19557138 is 83175591.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19557096 and 19557105.

It is not an unprimeable number, because it can be changed into a prime (19557133) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 21888 + ... + 22763.

It is an arithmetic number, because the mean of its divisors is an integer number (2478186).

Almost surely, 2^19557138 is an apocalyptic number.

19557138 is an abundant number, since it is smaller than the sum of its proper divisors (20093838).

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

19557138 is a wasteful number, since it uses less digits than its factorization.

19557138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44729.

The product of its digits is 37800, while the sum is 39.

The square root of 19557138 is about 4422.3453053781. The cubic root of 19557138 is about 269.4232682672.

The spelling of 19557138 in words is "nineteen million, five hundred fifty-seven thousand, one hundred thirty-eight".