212309847 has 6 divisors (see below), whose sum is σ = 306669792. Its totient is φ = 141539892.

The previous prime is 212309827. The next prime is 212309869. The reversal of 212309847 is 748903212.

It is not a de Polignac number, because 212309847 - 2²² = 208115543 is a prime.

It is a super-2 number, since 2×212309847² = 90150942266326818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212309807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11794983 + ... + 11795000.

It is an arithmetic number, because the mean of its divisors is an integer number (51111632).

Almost surely, 2^212309847 is an apocalyptic number.

212309847 is a deficient number, since it is larger than the sum of its proper divisors (94359945).

212309847 is a wasteful number, since it uses less digits than its factorization.

212309847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23589989 (or 23589986 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 212309847 is about 14570.8560832917. The cubic root of 212309847 is about 596.5635472297.

The spelling of 212309847 in words is "two hundred twelve million, three hundred nine thousand, eight hundred forty-seven".