25916399 has 16 divisors (see below), whose sum is σ = 28272000. Its totient is φ = 23677920.

The previous prime is 25916393. The next prime is 25916419. The reversal of 25916399 is 99361952.

It is a cyclic number.

It is not a de Polignac number, because 25916399 - 2⁴ = 25916383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25916393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68192 + ... + 68570.

It is an arithmetic number, because the mean of its divisors is an integer number (1767000).

Almost surely, 2^25916399 is an apocalyptic number.

25916399 is a deficient number, since it is larger than the sum of its proper divisors (2355601).

25916399 is a wasteful number, since it uses less digits than its factorization.

25916399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518.

The product of its digits is 131220, while the sum is 44.

The square root of 25916399 is about 5090.8151606594. The cubic root of 25916399 is about 295.9317433009.

The spelling of 25916399 in words is "twenty-five million, nine hundred sixteen thousand, three hundred ninety-nine".