307989440 has 112 divisors (see below), whose sum is σ = 814181760. Its totient is φ = 110023680.

The previous prime is 307989431. The next prime is 307989463. The reversal of 307989440 is 44989703.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 307989391 and 307989400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206939 + ... + 208421.

It is an arithmetic number, because the mean of its divisors is an integer number (7269480).

Almost surely, 2^307989440 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 307989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (407090880).

307989440 is an abundant number, since it is smaller than the sum of its proper divisors (506192320).

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

307989440 is a wasteful number, since it uses less digits than its factorization.

307989440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570 (or 1560 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 307989440 is about 17549.6279162836. The cubic root of 307989440 is about 675.3236235087.

The spelling of 307989440 in words is "three hundred seven million, nine hundred eighty-nine thousand, four hundred forty".