212189947 has 8 divisors (see below), whose sum is σ = 219287552. Its totient is φ = 205108200.

The previous prime is 212189941. The next prime is 212189951. The reversal of 212189947 is 749981212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212189947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212189941) 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, 27268 + ... + 34174.

It is an arithmetic number, because the mean of its divisors is an integer number (27410944).

Almost surely, 2^212189947 is an apocalyptic number.

212189947 is a deficient number, since it is larger than the sum of its proper divisors (7097605).

212189947 is an equidigital number, since it uses as much as digits as its factorization.

212189947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7929.

The product of its digits is 72576, while the sum is 43.

The square root of 212189947 is about 14566.7411249050. The cubic root of 212189947 is about 596.4512248551.

The spelling of 212189947 in words is "two hundred twelve million, one hundred eighty-nine thousand, nine hundred forty-seven".