25406977 has 2 divisors, whose sum is σ = 25406978. Its totient is φ = 25406976.

The previous prime is 25406963. The next prime is 25406989. The reversal of 25406977 is 77960452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14753281 + 10653696 = 3841^2 + 3264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25406977 is a prime.

It is not a weakly prime, because it can be changed into another prime (25406947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12703488 + 12703489.

It is an arithmetic number, because the mean of its divisors is an integer number (12703489).

Almost surely, 2^25406977 is an apocalyptic number.

It is an amenable number.

25406977 is a deficient number, since it is larger than the sum of its proper divisors (1).

25406977 is an equidigital number, since it uses as much as digits as its factorization.

25406977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 25406977 is about 5040.5334043135. The cubic root of 25406977 is about 293.9799182606.

The spelling of 25406977 in words is "twenty-five million, four hundred six thousand, nine hundred seventy-seven".