19138765 has 8 divisors (see below), whose sum is σ = 23177880. Its totient is φ = 15170112.

The previous prime is 19138733. The next prime is 19138781. The reversal of 19138765 is 56783191.

It can be written as a sum of positive squares in 4 ways, for example, as 33124 + 19105641 = 182^2 + 4371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19138765 - 2⁵ = 19138733 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17014 + ... + 18103.

It is an arithmetic number, because the mean of its divisors is an integer number (2897235).

Almost surely, 2^19138765 is an apocalyptic number.

It is an amenable number.

19138765 is a deficient number, since it is larger than the sum of its proper divisors (4039115).

19138765 is a wasteful number, since it uses less digits than its factorization.

19138765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35231.

The product of its digits is 45360, while the sum is 40.

The square root of 19138765 is about 4374.7874234070. The cubic root of 19138765 is about 267.4882051456.

The spelling of 19138765 in words is "nineteen million, one hundred thirty-eight thousand, seven hundred sixty-five".