19818065 has 8 divisors (see below), whose sum is σ = 24815808. Its totient is φ = 15165040.

The previous prime is 19818061. The next prime is 19818077. The reversal of 19818065 is 56081891.

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

It is not a de Polignac number, because 19818065 - 2² = 19818061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19818061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86051 + ... + 86280.

It is an arithmetic number, because the mean of its divisors is an integer number (3101976).

Almost surely, 2^19818065 is an apocalyptic number.

It is an amenable number.

19818065 is a deficient number, since it is larger than the sum of its proper divisors (4997743).

19818065 is a wasteful number, since it uses less digits than its factorization.

19818065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172359.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 19818065 is about 4451.7485328801. The cubic root of 19818065 is about 270.6161739055.

The spelling of 19818065 in words is "nineteen million, eight hundred eighteen thousand, sixty-five".