19493139 has 4 divisors (see below), whose sum is σ = 25990856. Its totient is φ = 12995424.

The previous prime is 19493119. The next prime is 19493161. The reversal of 19493139 is 93139491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93139491 = 3 ⋅31046497.

It is not a de Polignac number, because 19493139 - 2¹¹ = 19491091 is a prime.

It is a super-3 number, since 3×19493139³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19493097 and 19493106.

It is not an unprimeable number, because it can be changed into a prime (19493119) 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, 3248854 + ... + 3248859.

It is an arithmetic number, because the mean of its divisors is an integer number (6497714).

Almost surely, 2^19493139 is an apocalyptic number.

19493139 is a deficient number, since it is larger than the sum of its proper divisors (6497717).

19493139 is an equidigital number, since it uses as much as digits as its factorization.

19493139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6497716.

The product of its digits is 26244, while the sum is 39.

The square root of 19493139 is about 4415.1035095454. The cubic root of 19493139 is about 269.1290591904.

The spelling of 19493139 in words is "nineteen million, four hundred ninety-three thousand, one hundred thirty-nine".