80397809 has 4 divisors (see below), whose sum is σ = 80492916. Its totient is φ = 80302704.

The previous prime is 80397803. The next prime is 80397833. The reversal of 80397809 is 90879308.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49350625 + 31047184 = 7025^2 + 5572^2 .

It is a cyclic number.

It is not a de Polignac number, because 80397809 - 2²⁴ = 63620593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80397809.

It is not an unprimeable number, because it can be changed into a prime (80397803) 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, 46274 + ... + 47979.

It is an arithmetic number, because the mean of its divisors is an integer number (20123229).

Almost surely, 2^80397809 is an apocalyptic number.

It is an amenable number.

80397809 is a deficient number, since it is larger than the sum of its proper divisors (95107).

80397809 is an equidigital number, since it uses as much as digits as its factorization.

80397809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95106.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 80397809 is about 8966.4825321862. The cubic root of 80397809 is about 431.5999686920.

The spelling of 80397809 in words is "eighty million, three hundred ninety-seven thousand, eight hundred nine".