25697407 has 2 divisors, whose sum is σ = 25697408. Its totient is φ = 25697406.

The previous prime is 25697389. The next prime is 25697411. The reversal of 25697407 is 70479652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25697407 - 2¹¹ = 25695359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25697407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25697437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12848703 + 12848704.

It is an arithmetic number, because the mean of its divisors is an integer number (12848704).

Almost surely, 2^25697407 is an apocalyptic number.

25697407 is a deficient number, since it is larger than the sum of its proper divisors (1).

25697407 is an equidigital number, since it uses as much as digits as its factorization.

25697407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 25697407 is about 5069.2609915056. The cubic root of 25697407 is about 295.0958493480.

The spelling of 25697407 in words is "twenty-five million, six hundred ninety-seven thousand, four hundred seven".