25307987 has 2 divisors, whose sum is σ = 25307988. Its totient is φ = 25307986.

The previous prime is 25307983. The next prime is 25308011. The reversal of 25307987 is 78970352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25307987 - 2² = 25307983 is a prime.

It is not a weakly prime, because it can be changed into another prime (25307983) 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, 12653993 + 12653994.

It is an arithmetic number, because the mean of its divisors is an integer number (12653994).

Almost surely, 2^25307987 is an apocalyptic number.

25307987 is a deficient number, since it is larger than the sum of its proper divisors (1).

25307987 is an equidigital number, since it uses as much as digits as its factorization.

25307987 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 41.

The square root of 25307987 is about 5030.7044238357. The cubic root of 25307987 is about 293.5976223738.

The spelling of 25307987 in words is "twenty-five million, three hundred seven thousand, nine hundred eighty-seven".