307731420 has 144 divisors (see below), whose sum is σ = 990934560. Its totient is φ = 79280640.

The previous prime is 307731377. The next prime is 307731439. The reversal of 307731420 is 24137703.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 518644 + ... + 519236.

It is an arithmetic number, because the mean of its divisors is an integer number (6881490).

Almost surely, 2^307731420 is an apocalyptic number.

307731420 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 307731420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (495467280).

307731420 is an abundant number, since it is smaller than the sum of its proper divisors (683203140).

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

307731420 is a wasteful number, since it uses less digits than its factorization.

307731420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 307731420 is about 17542.2752230148. The cubic root of 307731420 is about 675.1349853497.

The spelling of 307731420 in words is "three hundred seven million, seven hundred thirty-one thousand, four hundred twenty".