25840427 has 2 divisors, whose sum is σ = 25840428. Its totient is φ = 25840426.

The previous prime is 25840417. The next prime is 25840429. The reversal of 25840427 is 72404852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25840427 - 2¹⁶ = 25774891 is a prime.

Together with 25840429, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25840393 and 25840402.

It is not a weakly prime, because it can be changed into another prime (25840429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12920213 + 12920214.

It is an arithmetic number, because the mean of its divisors is an integer number (12920214).

Almost surely, 2^25840427 is an apocalyptic number.

25840427 is a deficient number, since it is larger than the sum of its proper divisors (1).

25840427 is an equidigital number, since it uses as much as digits as its factorization.

25840427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 25840427 is about 5083.3480109078. The cubic root of 25840427 is about 295.6422929691.

The spelling of 25840427 in words is "twenty-five million, eight hundred forty thousand, four hundred twenty-seven".