8457989 has 2 divisors, whose sum is σ = 8457990. Its totient is φ = 8457988.

The previous prime is 8457973. The next prime is 8458001. The reversal of 8457989 is 9897548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6002500 + 2455489 = 2450^2 + 1567^2 .

It is a cyclic number.

It is not a de Polignac number, because 8457989 - 2⁴ = 8457973 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8453989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4228994 + 4228995.

It is an arithmetic number, because the mean of its divisors is an integer number (4228995).

Almost surely, 2^8457989 is an apocalyptic number.

It is an amenable number.

8457989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8457989 is an equidigital number, since it uses as much as digits as its factorization.

8457989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 50.

The square root of 8457989 is about 2908.2621958826. The cubic root of 8457989 is about 203.7459753053.

The spelling of 8457989 in words is "eight million, four hundred fifty-seven thousand, nine hundred eighty-nine".