818945709 has 8 divisors (see below), whose sum is σ = 1156158720. Its totient is φ = 513848256.

The previous prime is 818945669. The next prime is 818945711. The reversal of 818945709 is 907549818.

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

It is not a de Polignac number, because 818945709 - 2¹⁶ = 818880173 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 16057759 = 818945709 / (8 + 1 + 8 + 9 + 4 + 5 + 7 + 0 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818945779) 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, 8028829 + ... + 8028930.

It is an arithmetic number, because the mean of its divisors is an integer number (144519840).

Almost surely, 2^818945709 is an apocalyptic number.

It is an amenable number.

818945709 is a deficient number, since it is larger than the sum of its proper divisors (337213011).

818945709 is a wasteful number, since it uses less digits than its factorization.

818945709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16057779.

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 818945709 is about 28617.2274862538. The cubic root of 818945709 is about 935.5888496208.

The spelling of 818945709 in words is "eight hundred eighteen million, nine hundred forty-five thousand, seven hundred nine".