8120709 has 16 divisors (see below), whose sum is σ = 12109440. Its totient is φ = 5378400.

The previous prime is 8120699. The next prime is 8120711. The reversal of 8120709 is 9070218.

It is not a de Polignac number, because 8120709 - 2⁵ = 8120677 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8120719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3609 + ... + 5409.

It is an arithmetic number, because the mean of its divisors is an integer number (756840).

Almost surely, 2^8120709 is an apocalyptic number.

It is an amenable number.

8120709 is a deficient number, since it is larger than the sum of its proper divisors (3988731).

8120709 is a wasteful number, since it uses less digits than its factorization.

8120709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977 (or 1971 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 8120709 is about 2849.6857721510. The cubic root of 8120709 is about 201.0008910631. Note that the first 3 decimals are identical.

The spelling of 8120709 in words is "eight million, one hundred twenty thousand, seven hundred nine".