25980397 has 2 divisors, whose sum is σ = 25980398. Its totient is φ = 25980396.

The previous prime is 25980379. The next prime is 25980419. The reversal of 25980397 is 79308952.

It is a happy number.

Together with previous prime (25980379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22524516 + 3455881 = 4746^2 + 1859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25980397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25980307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12990198 + 12990199.

It is an arithmetic number, because the mean of its divisors is an integer number (12990199).

Almost surely, 2^25980397 is an apocalyptic number.

It is an amenable number.

25980397 is a deficient number, since it is larger than the sum of its proper divisors (1).

25980397 is an equidigital number, since it uses as much as digits as its factorization.

25980397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 25980397 is about 5097.0969188353. The cubic root of 25980397 is about 296.1751345181.

It can be divided in two parts, 259 and 80397, that added together give a square (80656 = 284²).

The spelling of 25980397 in words is "twenty-five million, nine hundred eighty thousand, three hundred ninety-seven".