309406836 has 12 divisors (see below), whose sum is σ = 721949312. Its totient is φ = 103135608.

The previous prime is 309406831. The next prime is 309406843. The reversal of 309406836 is 638604903.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 309406794 and 309406803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309406831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12891940 + ... + 12891963.

Almost surely, 2^309406836 is an apocalyptic number.

It is an amenable number.

309406836 is an abundant number, since it is smaller than the sum of its proper divisors (412542476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309406836 is a wasteful number, since it uses less digits than its factorization.

309406836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25783910 (or 25783908 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 309406836 is about 17589.9640704579. The cubic root of 309406836 is about 676.3580056934.

The spelling of 309406836 in words is "three hundred nine million, four hundred six thousand, eight hundred thirty-six".