19365138 has 24 divisors (see below), whose sum is σ = 45185868. Its totient is φ = 5958432.

The previous prime is 19365119. The next prime is 19365139. The reversal of 19365138 is 83156391.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19210689 + 154449 = 4383^2 + 393^2 .

It is not an unprimeable number, because it can be changed into a prime (19365139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41145 + ... + 41612.

Almost surely, 2^19365138 is an apocalyptic number.

19365138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19365138 is an abundant number, since it is smaller than the sum of its proper divisors (25820730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19365138 is a wasteful number, since it uses less digits than its factorization.

19365138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82778 (or 82775 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 19365138 is about 4400.5838249032. The cubic root of 19365138 is about 268.5386896382.

It can be divided in two parts, 19365 and 138, that added together give a triangular number (19503 = T₁₉₇).

The spelling of 19365138 in words is "nineteen million, three hundred sixty-five thousand, one hundred thirty-eight".