306840989 has 12 divisors (see below), whose sum is σ = 384395004. Its totient is φ = 242774784.

The previous prime is 306840943. The next prime is 306841001. The reversal of 306840989 is 989048603.

It can be written as a sum of positive squares in 2 ways, for example, as 29052100 + 277788889 = 5390^2 + 16667^2 .

It is not a de Polignac number, because 306840989 - 2¹⁶ = 306775453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306849989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240212 + ... + 241485.

It is an arithmetic number, because the mean of its divisors is an integer number (32032917).

Almost surely, 2^306840989 is an apocalyptic number.

It is an amenable number.

306840989 is a deficient number, since it is larger than the sum of its proper divisors (77554015).

306840989 is a wasteful number, since it uses less digits than its factorization.

306840989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481724 (or 481717 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 306840989 is about 17516.8772616583. The cubic root of 306840989 is about 674.4831811666.

The spelling of 306840989 in words is "three hundred six million, eight hundred forty thousand, nine hundred eighty-nine".