25823989 has 2 divisors, whose sum is σ = 25823990. Its totient is φ = 25823988.

The previous prime is 25823957. The next prime is 25824013. The reversal of 25823989 is 98932852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25502500 + 321489 = 5050^2 + 567^2 .

It is a cyclic number.

It is not a de Polignac number, because 25823989 - 2⁵ = 25823957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25823929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12911994 + 12911995.

It is an arithmetic number, because the mean of its divisors is an integer number (12911995).

Almost surely, 2^25823989 is an apocalyptic number.

It is an amenable number.

25823989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25823989 is an equidigital number, since it uses as much as digits as its factorization.

25823989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The square root of 25823989 is about 5081.7309059020. The cubic root of 25823989 is about 295.5795902015.

The spelling of 25823989 in words is "twenty-five million, eight hundred twenty-three thousand, nine hundred eighty-nine".