25687973 has 2 divisors, whose sum is σ = 25687974. Its totient is φ = 25687972.

The previous prime is 25687967. The next prime is 25687993. The reversal of 25687973 is 37978652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19918369 + 5769604 = 4463^2 + 2402^2 .

It is a cyclic number.

It is not a de Polignac number, because 25687973 - 2⁴ = 25687957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25687903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12843986 + 12843987.

It is an arithmetic number, because the mean of its divisors is an integer number (12843987).

Almost surely, 2^25687973 is an apocalyptic number.

It is an amenable number.

25687973 is a deficient number, since it is larger than the sum of its proper divisors (1).

25687973 is an equidigital number, since it uses as much as digits as its factorization.

25687973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The square root of 25687973 is about 5068.3303957023. The cubic root of 25687973 is about 295.0597331880.

The spelling of 25687973 in words is "twenty-five million, six hundred eighty-seven thousand, nine hundred seventy-three".