25138643 has 2 divisors, whose sum is σ = 25138644. Its totient is φ = 25138642.

The previous prime is 25138637. The next prime is 25138667. The reversal of 25138643 is 34683152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25138643 - 2⁴ = 25138627 is a prime.

It is not a weakly prime, because it can be changed into another prime (25138693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12569321 + 12569322.

It is an arithmetic number, because the mean of its divisors is an integer number (12569322).

Almost surely, 2^25138643 is an apocalyptic number.

25138643 is a deficient number, since it is larger than the sum of its proper divisors (1).

25138643 is an equidigital number, since it uses as much as digits as its factorization.

25138643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 32.

The square root of 25138643 is about 5013.8451312341. The cubic root of 25138643 is about 292.9413038080.

The spelling of 25138643 in words is "twenty-five million, one hundred thirty-eight thousand, six hundred forty-three".