19538138 has 8 divisors (see below), whose sum is σ = 29744832. Its totient is φ = 9623196.

The previous prime is 19538131. The next prime is 19538143. The reversal of 19538138 is 83183591.

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

It is not an unprimeable number, because it can be changed into a prime (19538131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72770 + ... + 73037.

It is an arithmetic number, because the mean of its divisors is an integer number (3718104).

Almost surely, 2^19538138 is an apocalyptic number.

19538138 is a deficient number, since it is larger than the sum of its proper divisors (10206694).

19538138 is a wasteful number, since it uses less digits than its factorization.

19538138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145876.

The product of its digits is 25920, while the sum is 38.

The square root of 19538138 is about 4420.1966019624. The cubic root of 19538138 is about 269.3359906582.

The spelling of 19538138 in words is "nineteen million, five hundred thirty-eight thousand, one hundred thirty-eight".