212972389 has 4 divisors (see below), whose sum is σ = 243397024. Its totient is φ = 182547756.

The previous prime is 212972339. The next prime is 212972401. The reversal of 212972389 is 983279212.

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 212972389 - 2¹⁵ = 212939621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212972339) 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, 15212307 + ... + 15212320.

It is an arithmetic number, because the mean of its divisors is an integer number (60849256).

Almost surely, 2^212972389 is an apocalyptic number.

It is an amenable number.

212972389 is a deficient number, since it is larger than the sum of its proper divisors (30424635).

212972389 is an equidigital number, since it uses as much as digits as its factorization.

212972389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30424634.

The product of its digits is 108864, while the sum is 43.

The square root of 212972389 is about 14593.5735513958. The cubic root of 212972389 is about 597.1834556329.

The spelling of 212972389 in words is "two hundred twelve million, nine hundred seventy-two thousand, three hundred eighty-nine".