25697449 has 4 divisors (see below), whose sum is σ = 25719120. Its totient is φ = 25675780.

The previous prime is 25697437. The next prime is 25697453. The reversal of 25697449 is 94479652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25697449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25697399 and 25697408.

It is not an unprimeable number, because it can be changed into a prime (25697429) 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, 8947 + ... + 11464.

It is an arithmetic number, because the mean of its divisors is an integer number (6429780).

Almost surely, 2^25697449 is an apocalyptic number.

It is an amenable number.

25697449 is a deficient number, since it is larger than the sum of its proper divisors (21671).

25697449 is a wasteful number, since it uses less digits than its factorization.

25697449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21670.

The product of its digits is 544320, while the sum is 46.

The square root of 25697449 is about 5069.2651341195. The cubic root of 25697449 is about 295.0960101168.

The spelling of 25697449 in words is "twenty-five million, six hundred ninety-seven thousand, four hundred forty-nine".