80409 has 12 divisors (see below), whose sum is σ = 124944. Its totient is φ = 45864.

The previous prime is 80407. The next prime is 80429. The reversal of 80409 is 90408.

It is not a de Polignac number, because 80409 - 2¹ = 80407 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (80407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127 + ... + 420.

It is an arithmetic number, because the mean of its divisors is an integer number (10412).

2⁸⁰⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

80409 is a deficient number, since it is larger than the sum of its proper divisors (44535).

80409 is a wasteful number, since it uses less digits than its factorization.

80409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 80409 is about 283.5648074074. The cubic root of 80409 is about 43.1619993330.

Subtracting 80409 from its reverse (90408), we obtain a palindrome (9999).

The spelling of 80409 in words is "eighty thousand, four hundred nine".