212640189 has 16 divisors (see below), whose sum is σ = 288921600. Its totient is φ = 139069616.

The previous prime is 212640179. The next prime is 212640193. The reversal of 212640189 is 981046212.

It is a cyclic number.

It is not a de Polignac number, because 212640189 - 2⁹ = 212639677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212640119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115732 + ... + 117554.

It is an arithmetic number, because the mean of its divisors is an integer number (18057600).

Almost surely, 2^212640189 is an apocalyptic number.

It is an amenable number.

212640189 is a deficient number, since it is larger than the sum of its proper divisors (76281411).

212640189 is a wasteful number, since it uses less digits than its factorization.

212640189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 212640189 is about 14582.1873873572. The cubic root of 212640189 is about 596.8727931682.

The spelling of 212640189 in words is "two hundred twelve million, six hundred forty thousand, one hundred eighty-nine".