309404 has 6 divisors (see below), whose sum is σ = 541464. Its totient is φ = 154700.

The previous prime is 309403. The next prime is 309433. The reversal of 309404 is 404903.

309404 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309404.

It is not an unprimeable number, because it can be changed into a prime (309403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38672 + ... + 38679.

It is an arithmetic number, because the mean of its divisors is an integer number (90244).

2³⁰⁹⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

309404 is a deficient number, since it is larger than the sum of its proper divisors (232060).

309404 is a wasteful number, since it uses less digits than its factorization.

309404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77355 (or 77353 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 309404 is about 556.2409549826. The cubic root of 309404 is about 67.6355939205.

The spelling of 309404 in words is "three hundred nine thousand, four hundred four".