219453989 has 4 divisors (see below), whose sum is σ = 219793824. Its totient is φ = 219114156.

The previous prime is 219453959. The next prime is 219454007. The reversal of 219453989 is 989354912.

It is a happy number.

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 219453989 - 2¹⁶ = 219388453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219453959) 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, 168947 + ... + 170240.

It is an arithmetic number, because the mean of its divisors is an integer number (54948456).

Almost surely, 2^219453989 is an apocalyptic number.

It is an amenable number.

219453989 is a deficient number, since it is larger than the sum of its proper divisors (339835).

219453989 is an equidigital number, since it uses as much as digits as its factorization.

219453989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339834.

The product of its digits is 699840, while the sum is 50.

The square root of 219453989 is about 14813.9795126090. The cubic root of 219453989 is about 603.1812409956.

The spelling of 219453989 in words is "two hundred nineteen million, four hundred fifty-three thousand, nine hundred eighty-nine".