19139438 has 4 divisors (see below), whose sum is σ = 28709160. Its totient is φ = 9569718.

The previous prime is 19139437. The next prime is 19139459. The reversal of 19139438 is 83493191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83493191 = 4357 ⋅19163.

It is a super-3 number, since 3×19139438³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19139437) 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 as a sum of consecutive naturals, namely, 4784858 + ... + 4784861.

It is an arithmetic number, because the mean of its divisors is an integer number (7177290).

Almost surely, 2^19139438 is an apocalyptic number.

19139438 is a deficient number, since it is larger than the sum of its proper divisors (9569722).

19139438 is an equidigital number, since it uses as much as digits as its factorization.

19139438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9569721.

The product of its digits is 23328, while the sum is 38.

The square root of 19139438 is about 4374.8643407539. The cubic root of 19139438 is about 267.4913404481.

The spelling of 19139438 in words is "nineteen million, one hundred thirty-nine thousand, four hundred thirty-eight".