25489040 has 40 divisors (see below), whose sum is σ = 60531840. Its totient is φ = 9977216.

The previous prime is 25489039. The next prime is 25489049. The reversal of 25489040 is 4098452.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 25488988 and 25489006.

It is not an unprimeable number, because it can be changed into a prime (25489049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371 + ... + 7149.

It is an arithmetic number, because the mean of its divisors is an integer number (1513296).

Almost surely, 2^25489040 is an apocalyptic number.

25489040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25489040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30265920).

25489040 is an abundant number, since it is smaller than the sum of its proper divisors (35042800).

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

25489040 is a wasteful number, since it uses less digits than its factorization.

25489040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6839 (or 6833 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 25489040 is about 5048.6671508429. The cubic root of 25489040 is about 294.2960905542.

The spelling of 25489040 in words is "twenty-five million, four hundred eighty-nine thousand, forty".