306805212 has 48 divisors (see below), whose sum is σ = 909054720. Its totient is φ = 87658416.

The previous prime is 306805199. The next prime is 306805223. The reversal of 306805212 is 212508603.

It is a super-2 number, since 2×306805212² = 188258876220729888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202158 + ... + 203669.

It is an arithmetic number, because the mean of its divisors is an integer number (18938640).

Almost surely, 2^306805212 is an apocalyptic number.

It is an amenable number.

306805212 is an abundant number, since it is smaller than the sum of its proper divisors (602249508).

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

306805212 is a wasteful number, since it uses less digits than its factorization.

306805212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405847 (or 405839 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 306805212 is about 17515.8560167638. The cubic root of 306805212 is about 674.4569657178.

The spelling of 306805212 in words is "three hundred six million, eight hundred five thousand, two hundred twelve".