212989 has 4 divisors (see below), whose sum is σ = 243424. Its totient is φ = 182556.

The previous prime is 212987. The next prime is 212999. The reversal of 212989 is 989212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212989 - 2¹ = 212987 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

212989 is a lucky number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 212989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15207 + ... + 15220.

It is an arithmetic number, because the mean of its divisors is an integer number (60856).

2²¹²⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

212989 is a deficient number, since it is larger than the sum of its proper divisors (30435).

212989 is an equidigital number, since it uses as much as digits as its factorization.

212989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30434.

The product of its digits is 2592, while the sum is 31.

The square root of 212989 is about 461.5073130515. The cubic root of 212989 is about 59.7198981208.

The spelling of 212989 in words is "two hundred twelve thousand, nine hundred eighty-nine".