25638947 has 2 divisors, whose sum is σ = 25638948. Its totient is φ = 25638946.

The previous prime is 25638913. The next prime is 25638973. The reversal of 25638947 is 74983652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25638947 - 2⁶ = 25638883 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 25638898 and 25638907.

It is not a weakly prime, because it can be changed into another prime (25638047) 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, 12819473 + 12819474.

It is an arithmetic number, because the mean of its divisors is an integer number (12819474).

Almost surely, 2^25638947 is an apocalyptic number.

25638947 is a deficient number, since it is larger than the sum of its proper divisors (1).

25638947 is an equidigital number, since it uses as much as digits as its factorization.

25638947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 25638947 is about 5063.4915819027. The cubic root of 25638947 is about 294.8719045509.

The spelling of 25638947 in words is "twenty-five million, six hundred thirty-eight thousand, nine hundred forty-seven".