306388340 has 12 divisors (see below), whose sum is σ = 643415556. Its totient is φ = 122555328.

The previous prime is 306388339. The next prime is 306388349. The reversal of 306388340 is 43883603.

It can be written as a sum of positive squares in 2 ways, for example, as 161137636 + 145250704 = 12694^2 + 12052^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 306388340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306388349) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7659689 + ... + 7659728.

It is an arithmetic number, because the mean of its divisors is an integer number (53617963).

Almost surely, 2^306388340 is an apocalyptic number.

It is an amenable number.

306388340 is an abundant number, since it is smaller than the sum of its proper divisors (337027216).

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

306388340 is a wasteful number, since it uses less digits than its factorization.

306388340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15319426 (or 15319424 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 306388340 is about 17503.9521251630. The cubic root of 306388340 is about 674.1513541521.

The spelling of 306388340 in words is "three hundred six million, three hundred eighty-eight thousand, three hundred forty".