25078399 has 2 divisors, whose sum is σ = 25078400. Its totient is φ = 25078398.

The previous prime is 25078397. The next prime is 25078421. The reversal of 25078399 is 99387052.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25078399 - 2¹ = 25078397 is a prime.

Together with 25078397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25078397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12539199 + 12539200.

It is an arithmetic number, because the mean of its divisors is an integer number (12539200).

Almost surely, 2^25078399 is an apocalyptic number.

25078399 is a deficient number, since it is larger than the sum of its proper divisors (1).

25078399 is an equidigital number, since it uses as much as digits as its factorization.

25078399 is an evil number, because the sum of its binary digits is even.

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

The square root of 25078399 is about 5007.8337632154. The cubic root of 25078399 is about 292.7071082933.

The spelling of 25078399 in words is "twenty-five million, seventy-eight thousand, three hundred ninety-nine".