19785065 has 4 divisors (see below), whose sum is σ = 23742084. Its totient is φ = 15828048.

The previous prime is 19785053. The next prime is 19785067. The reversal of 19785065 is 56058791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56058791 = 59 ⋅950149.

It can be written as a sum of positive squares in 2 ways, for example, as 7203856 + 12581209 = 2684^2 + 3547^2 .

It is a cyclic number.

It is not a de Polignac number, because 19785065 - 2²² = 15590761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19785067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1978502 + ... + 1978511.

It is an arithmetic number, because the mean of its divisors is an integer number (5935521).

Almost surely, 2^19785065 is an apocalyptic number.

It is an amenable number.

19785065 is a deficient number, since it is larger than the sum of its proper divisors (3957019).

19785065 is an equidigital number, since it uses as much as digits as its factorization.

19785065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957018.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 19785065 is about 4448.0405798509. The cubic root of 19785065 is about 270.4658851815.

The spelling of 19785065 in words is "nineteen million, seven hundred eighty-five thousand, sixty-five".