309423708 has 72 divisors (see below), whose sum is σ = 856791936. Its totient is φ = 93376800.

The previous prime is 309423691. The next prime is 309423731. The reversal of 309423708 is 807324903.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102663 + ... + 105633.

It is an arithmetic number, because the mean of its divisors is an integer number (11899888).

Almost surely, 2^309423708 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309423708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (428395968).

309423708 is an abundant number, since it is smaller than the sum of its proper divisors (547368228).

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

309423708 is a wasteful number, since it uses less digits than its factorization.

309423708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255 (or 3250 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 309423708 is about 17590.4436555762. The cubic root of 309423708 is about 676.3702994369.

The spelling of 309423708 in words is "three hundred nine million, four hundred twenty-three thousand, seven hundred eight".