25785449 has 2 divisors, whose sum is σ = 25785450. Its totient is φ = 25785448.

The previous prime is 25785443. The next prime is 25785479. The reversal of 25785449 is 94458752.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23697424 + 2088025 = 4868^2 + 1445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25785449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25785443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12892724 + 12892725.

It is an arithmetic number, because the mean of its divisors is an integer number (12892725).

Almost surely, 2^25785449 is an apocalyptic number.

It is an amenable number.

25785449 is a deficient number, since it is larger than the sum of its proper divisors (1).

25785449 is an equidigital number, since it uses as much as digits as its factorization.

25785449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 44.

The square root of 25785449 is about 5077.9374749991. The cubic root of 25785449 is about 295.4324749345.

The spelling of 25785449 in words is "twenty-five million, seven hundred eighty-five thousand, four hundred forty-nine".