454439989 has 2 divisors, whose sum is σ = 454439990. Its totient is φ = 454439988.

The previous prime is 454439987. The next prime is 454440011. The reversal of 454439989 is 989934454.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340697764 + 113742225 = 18458^2 + 10665^2 .

It is a cyclic number.

It is not a de Polignac number, because 454439989 - 2¹ = 454439987 is a prime.

Together with 454439987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (454439981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227219994 + 227219995.

It is an arithmetic number, because the mean of its divisors is an integer number (227219995).

Almost surely, 2^454439989 is an apocalyptic number.

It is an amenable number.

454439989 is a deficient number, since it is larger than the sum of its proper divisors (1).

454439989 is an equidigital number, since it uses as much as digits as its factorization.

454439989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 55.

The square root of 454439989 is about 21317.5981057904. The cubic root of 454439989 is about 768.8214888990.

The spelling of 454439989 in words is "four hundred fifty-four million, four hundred thirty-nine thousand, nine hundred eighty-nine".