39889457 has 2 divisors, whose sum is σ = 39889458. Its totient is φ = 39889456.

The previous prime is 39889439. The next prime is 39889459. The reversal of 39889457 is 75498893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31181056 + 8708401 = 5584^2 + 2951^2 .

It is an emirp because it is prime and its reverse (75498893) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39889457 is a prime.

Together with 39889459, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 39889399 and 39889408.

It is not a weakly prime, because it can be changed into another prime (39889459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19944728 + 19944729.

It is an arithmetic number, because the mean of its divisors is an integer number (19944729).

Almost surely, 2^39889457 is an apocalyptic number.

It is an amenable number.

39889457 is a deficient number, since it is larger than the sum of its proper divisors (1).

39889457 is an equidigital number, since it uses as much as digits as its factorization.

39889457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The square root of 39889457 is about 6315.8100826418. The cubic root of 39889457 is about 341.6798555554.

The spelling of 39889457 in words is "thirty-nine million, eight hundred eighty-nine thousand, four hundred fifty-seven".