25709623 has 2 divisors, whose sum is σ = 25709624. Its totient is φ = 25709622.

The previous prime is 25709617. The next prime is 25709659. The reversal of 25709623 is 32690752.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25709623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25709683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12854811 + 12854812.

It is an arithmetic number, because the mean of its divisors is an integer number (12854812).

Almost surely, 2^25709623 is an apocalyptic number.

25709623 is a deficient number, since it is larger than the sum of its proper divisors (1).

25709623 is an equidigital number, since it uses as much as digits as its factorization.

25709623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 25709623 is about 5070.4657576992. The cubic root of 25709623 is about 295.1426027010.

The spelling of 25709623 in words is "twenty-five million, seven hundred nine thousand, six hundred twenty-three".