25399867 has 2 divisors, whose sum is σ = 25399868. Its totient is φ = 25399866.

The previous prime is 25399849. The next prime is 25399883. The reversal of 25399867 is 76899352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25399867 - 2⁷ = 25399739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25399867.

It is not a weakly prime, because it can be changed into another prime (25399807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12699933 + 12699934.

It is an arithmetic number, because the mean of its divisors is an integer number (12699934).

Almost surely, 2^25399867 is an apocalyptic number.

25399867 is a deficient number, since it is larger than the sum of its proper divisors (1).

25399867 is an equidigital number, since it uses as much as digits as its factorization.

25399867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The square root of 25399867 is about 5039.8280724644. The cubic root of 25399867 is about 293.9524928251.

The spelling of 25399867 in words is "twenty-five million, three hundred ninety-nine thousand, eight hundred sixty-seven".