309406 has 8 divisors (see below), whose sum is σ = 471240. Its totient is φ = 152328.

The previous prime is 309403. The next prime is 309433. The reversal of 309406 is 604903.

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

It is a nialpdrome in base 13.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 1021 + ... + 1288.

It is an arithmetic number, because the mean of its divisors is an integer number (58905).

2³⁰⁹⁴⁰⁶ is an apocalyptic number.

309406 is a deficient number, since it is larger than the sum of its proper divisors (161834).

309406 is a wasteful number, since it uses less digits than its factorization.

309406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 309406 is about 556.2427527618. The cubic root of 309406 is about 67.6357396532.

The spelling of 309406 in words is "three hundred nine thousand, four hundred six".