19138 has 8 divisors (see below), whose sum is σ = 32832. Its totient is φ = 8196.

The previous prime is 19121. The next prime is 19139. The reversal of 19138 is 83191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (19139) by changing a digit.

19138 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670 + ... + 697.

It is an arithmetic number, because the mean of its divisors is an integer number (4104).

2¹⁹¹³⁸ is an apocalyptic number.

19138 is a deficient number, since it is larger than the sum of its proper divisors (13694).

19138 is a wasteful number, since it uses less digits than its factorization.

19138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376.

The product of its digits is 216, while the sum is 22.

The square root of 19138 is about 138.3401604741. The cubic root of 19138 is about 26.7484641154.

The spelling of 19138 in words is "nineteen thousand, one hundred thirty-eight".