309059940 has 96 divisors (see below), whose sum is σ = 991678464. Its totient is φ = 70450560.

The previous prime is 309059939. The next prime is 309059941. The reversal of 309059940 is 49950903.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (309059939) and next prime (309059941).

It is not an unprimeable number, because it can be changed into a prime (309059941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203785 + ... + 205295.

It is an arithmetic number, because the mean of its divisors is an integer number (10329984).

Almost surely, 2^309059940 is an apocalyptic number.

309059940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309059940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (495839232).

309059940 is an abundant number, since it is smaller than the sum of its proper divisors (682618524).

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

309059940 is a wasteful number, since it uses less digits than its factorization.

309059940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017 (or 2015 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 309059940 is about 17580.1006823055. The cubic root of 309059940 is about 676.1051416119.

The spelling of 309059940 in words is "three hundred nine million, fifty-nine thousand, nine hundred forty".