25440534 has 128 divisors (see below), whose sum is σ = 70917120. Its totient is φ = 6594048.

The previous prime is 25440533. The next prime is 25440539. The reversal of 25440534 is 43504452.

25440534 is a `hidden beast` number, since 254 + 405 + 3 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 25440498 and 25440507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25440533) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 237709 + ... + 237815.

It is an arithmetic number, because the mean of its divisors is an integer number (554040).

Almost surely, 2^25440534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25440534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35458560).

25440534 is an abundant number, since it is smaller than the sum of its proper divisors (45476586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25440534 is a wasteful number, since it uses less digits than its factorization.

25440534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 25440534 is about 5043.8610210830. The cubic root of 25440534 is about 294.1092888150.

Adding to 25440534 its reverse (43504452), we get a palindrome (68944986).

The spelling of 25440534 in words is "twenty-five million, four hundred forty thousand, five hundred thirty-four".