306705140 has 24 divisors (see below), whose sum is σ = 736092672. Its totient is φ = 105156000.

The previous prime is 306705101. The next prime is 306705151. The reversal of 306705140 is 41507603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1095236 + ... + 1095515.

It is an arithmetic number, because the mean of its divisors is an integer number (30670528).

Almost surely, 2^306705140 is an apocalyptic number.

It is an amenable number.

306705140 is an abundant number, since it is smaller than the sum of its proper divisors (429387532).

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

306705140 is a wasteful number, since it uses less digits than its factorization.

306705140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190767 (or 2190765 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 306705140 is about 17512.9991720436. Note that the first 3 decimals coincide. The cubic root of 306705140 is about 674.3836275492.

The spelling of 306705140 in words is "three hundred six million, seven hundred five thousand, one hundred forty".