307421220 has 96 divisors (see below), whose sum is σ = 902135808. Its totient is φ = 78072192.

The previous prime is 307421209. The next prime is 307421221. The reversal of 307421220 is 22124703.

It is not an unprimeable number, because it can be changed into a prime (307421221) 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, 506157 + ... + 506763.

It is an arithmetic number, because the mean of its divisors is an integer number (9397248).

Almost surely, 2^307421220 is an apocalyptic number.

307421220 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 307421220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (451067904).

307421220 is an abundant number, since it is smaller than the sum of its proper divisors (594714588).

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

307421220 is a wasteful number, since it uses less digits than its factorization.

307421220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 1007 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 307421220 is about 17533.4314952892. The cubic root of 307421220 is about 674.9080588079.

Adding to 307421220 its reverse (22124703), we get a palindrome (329545923).

The spelling of 307421220 in words is "three hundred seven million, four hundred twenty-one thousand, two hundred twenty".