25216399 has 16 divisors (see below), whose sum is σ = 28314720. Its totient is φ = 22296960.

The previous prime is 25216397. The next prime is 25216403. The reversal of 25216399 is 99361252.

It is a cyclic number.

It is not a de Polignac number, because 25216399 - 2¹ = 25216397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25216391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79389 + ... + 79705.

It is an arithmetic number, because the mean of its divisors is an integer number (1769670).

Almost surely, 2^25216399 is an apocalyptic number.

25216399 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

25216399 is a deficient number, since it is larger than the sum of its proper divisors (3098321).

25216399 is a wasteful number, since it uses less digits than its factorization.

25216399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570.

The product of its digits is 29160, while the sum is 37.

The square root of 25216399 is about 5021.5932730559. The cubic root of 25216399 is about 293.2430238806.

The spelling of 25216399 in words is "twenty-five million, two hundred sixteen thousand, three hundred ninety-nine".