206422989 has 4 divisors (see below), whose sum is σ = 275230656. Its totient is φ = 137615324.

The previous prime is 206422981. The next prime is 206423053. The reversal of 206422989 is 989224602.

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 206422989 - 2³ = 206422981 is a prime.

It is a super-2 number, since 2×206422989² = 85220900775388242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206422989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206422981) 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, 34403829 + ... + 34403834.

It is an arithmetic number, because the mean of its divisors is an integer number (68807664).

Almost surely, 2^206422989 is an apocalyptic number.

It is an amenable number.

206422989 is a deficient number, since it is larger than the sum of its proper divisors (68807667).

206422989 is an equidigital number, since it uses as much as digits as its factorization.

206422989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68807666.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 206422989 is about 14367.4280579372. The cubic root of 206422989 is about 590.9980130544.

The spelling of 206422989 in words is "two hundred six million, four hundred twenty-two thousand, nine hundred eighty-nine".