307989220 has 96 divisors (see below), whose sum is σ = 825302016. Its totient is φ = 93744000.

The previous prime is 307989181. The next prime is 307989223. The reversal of 307989220 is 22989703.

It is not an unprimeable number, because it can be changed into a prime (307989223) 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, 63895 + ... + 68545.

It is an arithmetic number, because the mean of its divisors is an integer number (8596896).

Almost surely, 2^307989220 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 307989220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412651008).

307989220 is an abundant number, since it is smaller than the sum of its proper divisors (517312796).

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

307989220 is a wasteful number, since it uses less digits than its factorization.

307989220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4721 (or 4719 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 307989220 is about 17549.6216483433. The cubic root of 307989220 is about 675.3234627118.

The spelling of 307989220 in words is "three hundred seven million, nine hundred eighty-nine thousand, two hundred twenty".