306646989 has 8 divisors (see below), whose sum is σ = 446032032. Its totient is φ = 185846640.

The previous prime is 306646987. The next prime is 306646993. The reversal of 306646989 is 989646603.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 306646989 - 2¹ = 306646987 is a prime.

It is a super-2 number, since 2×306646989² = 188064751725532242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306646981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4646134 + ... + 4646199.

It is an arithmetic number, because the mean of its divisors is an integer number (55754004).

Almost surely, 2^306646989 is an apocalyptic number.

It is an amenable number.

306646989 is a deficient number, since it is larger than the sum of its proper divisors (139385043).

306646989 is a wasteful number, since it uses less digits than its factorization.

306646989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9292347.

The product of its (nonzero) digits is 1679616, while the sum is 51.

The square root of 306646989 is about 17511.3388694297. The cubic root of 306646989 is about 674.3410040259.

The spelling of 306646989 in words is "three hundred six million, six hundred forty-six thousand, nine hundred eighty-nine".