306689940 has 36 divisors (see below), whose sum is σ = 930293364. Its totient is φ = 81783936.

The previous prime is 306689869. The next prime is 306689947. The reversal of 306689940 is 49986603.

It can be written as a sum of positive squares in 2 ways, for example, as 182412036 + 124277904 = 13506^2 + 11148^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306689947) 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, 851737 + ... + 852096.

Almost surely, 2^306689940 is an apocalyptic number.

306689940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

306689940 is an abundant number, since it is smaller than the sum of its proper divisors (623603424).

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

306689940 is a wasteful number, since it uses less digits than its factorization.

306689940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703848 (or 1703843 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 306689940 is about 17512.5652033047. The cubic root of 306689940 is about 674.3724867724.

The spelling of 306689940 in words is "three hundred six million, six hundred eighty-nine thousand, nine hundred forty".