25730399 has 4 divisors (see below), whose sum is σ = 26849136. Its totient is φ = 24611664.

The previous prime is 25730359. The next prime is 25730407. The reversal of 25730399 is 99303752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25730399 - 2⁸ = 25730143 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 (25730359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559334 + ... + 559379.

It is an arithmetic number, because the mean of its divisors is an integer number (6712284).

Almost surely, 2^25730399 is an apocalyptic number.

25730399 is a deficient number, since it is larger than the sum of its proper divisors (1118737).

25730399 is a wasteful number, since it uses less digits than its factorization.

25730399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118736.

The product of its (nonzero) digits is 51030, while the sum is 38.

The square root of 25730399 is about 5072.5140709514. The cubic root of 25730399 is about 295.2220830798. Note that the first 3 decimals are identical.

The spelling of 25730399 in words is "twenty-five million, seven hundred thirty thousand, three hundred ninety-nine".