19139018 has 4 divisors (see below), whose sum is σ = 28708530. Its totient is φ = 9569508.

The previous prime is 19139017. The next prime is 19139039. The reversal of 19139018 is 81093191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81093191 = 151 ⋅537041.

It can be written as a sum of positive squares in only one way, i.e., 16459249 + 2679769 = 4057^2 + 1637^2 .

It is not an unprimeable number, because it can be changed into a prime (19139017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4784753 + ... + 4784756.

Almost surely, 2^19139018 is an apocalyptic number.

19139018 is a deficient number, since it is larger than the sum of its proper divisors (9569512).

19139018 is an equidigital number, since it uses as much as digits as its factorization.

19139018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9569511.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 19139018 is about 4374.8163390021. The cubic root of 19139018 is about 267.4893838044.

The spelling of 19139018 in words is "nineteen million, one hundred thirty-nine thousand, eighteen".