212403089 has 4 divisors (see below), whose sum is σ = 212868324. Its totient is φ = 211937856.

The previous prime is 212403067. The next prime is 212403119. The reversal of 212403089 is 980304212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 125260864 + 87142225 = 11192^2 + 9335^2 .

It is a cyclic number.

It is not a de Polignac number, because 212403089 - 2¹² = 212398993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212403029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231932 + ... + 232845.

It is an arithmetic number, because the mean of its divisors is an integer number (53217081).

Almost surely, 2^212403089 is an apocalyptic number.

It is an amenable number.

212403089 is a deficient number, since it is larger than the sum of its proper divisors (465235).

212403089 is an equidigital number, since it uses as much as digits as its factorization.

212403089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465234.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 212403089 is about 14574.0553381686. The cubic root of 212403089 is about 596.6508671506.

The spelling of 212403089 in words is "two hundred twelve million, four hundred three thousand, eighty-nine".