Search a number
-
+
25490 = 252549

25490 has 8 divisors (see below), whose sum is σ = 45900. Its totient is φ = 10192.

The previous prime is 25471. The next prime is 25523. The reversal of 25490 is 9452.

It can be written as a sum of positive squares in 2 ways, for example, as 24649 + 841 = 157^2 + 29^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1265 + ... + 1284.

225490 is an apocalyptic number.

25490 is a deficient number, since it is larger than the sum of its proper divisors (20410).

25490 is a wasteful number, since it uses less digits than its factorization.

25490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 25490 is about 159.6558799418. The cubic root of 25490 is about 29.4299785223.

It can be divided in two parts, 25 and 490, that added together give a palindrome (515).

The spelling of 25490 in words is "twenty-five thousand, four hundred ninety".

Divisors: 1 2 5 10 2549 5098 12745 25490