25493887 has 2 divisors, whose sum is σ = 25493888. Its totient is φ = 25493886.

The previous prime is 25493869. The next prime is 25493903. The reversal of 25493887 is 78839452.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25493887 is a prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25493807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12746943 + 12746944.

It is an arithmetic number, because the mean of its divisors is an integer number (12746944).

Almost surely, 2^25493887 is an apocalyptic number.

25493887 is a deficient number, since it is larger than the sum of its proper divisors (1).

25493887 is an equidigital number, since it uses as much as digits as its factorization.

25493887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 46.

The square root of 25493887 is about 5049.1471557086. The cubic root of 25493887 is about 294.3147438361.

It can be divided in two parts, 254938 and 87, that added together give a square (255025 = 505²).

The spelling of 25493887 in words is "twenty-five million, four hundred ninety-three thousand, eight hundred eighty-seven".