19140239 has 4 divisors (see below), whose sum is σ = 20147640. Its totient is φ = 18132840.

The previous prime is 19140227. The next prime is 19140241. The reversal of 19140239 is 93204191.

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: 93204191 = 7937 ⋅11743.

It is not a de Polignac number, because 19140239 - 2⁸ = 19139983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19140269) 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 3 ways as a sum of consecutive naturals, for example, 503672 + ... + 503709.

It is an arithmetic number, because the mean of its divisors is an integer number (5036910).

Almost surely, 2^19140239 is an apocalyptic number.

19140239 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19140239 is a deficient number, since it is larger than the sum of its proper divisors (1007401).

19140239 is a wasteful number, since it uses less digits than its factorization.

19140239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007400.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 19140239 is about 4374.9558854919. The cubic root of 19140239 is about 267.4950719679.

The spelling of 19140239 in words is "nineteen million, one hundred forty thousand, two hundred thirty-nine".