19135993 has 4 divisors (see below), whose sum is σ = 19653220. Its totient is φ = 18618768.

The previous prime is 19135981. The next prime is 19136011. The reversal of 19135993 is 39953191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39953191 = 71 ⋅562721.

It can be written as a sum of positive squares in 2 ways, for example, as 16711744 + 2424249 = 4088^2 + 1557^2 .

It is a cyclic number.

It is not a de Polignac number, because 19135993 - 2²¹ = 17038841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19135913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258558 + ... + 258631.

It is an arithmetic number, because the mean of its divisors is an integer number (4913305).

Almost surely, 2^19135993 is an apocalyptic number.

It is an amenable number.

19135993 is a deficient number, since it is larger than the sum of its proper divisors (517227).

19135993 is an equidigital number, since it uses as much as digits as its factorization.

19135993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517226.

The product of its digits is 32805, while the sum is 40.

The square root of 19135993 is about 4374.4705965408. The cubic root of 19135993 is about 267.4752904651.

The spelling of 19135993 in words is "nineteen million, one hundred thirty-five thousand, nine hundred ninety-three".