25145840 has 40 divisors (see below), whose sum is σ = 58673328. Its totient is φ = 10022400.

The previous prime is 25145821. The next prime is 25145849. The reversal of 25145840 is 4854152.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25145849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41540 + ... + 42140.

Almost surely, 2^25145840 is an apocalyptic number.

25145840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25145840 is an abundant number, since it is smaller than the sum of its proper divisors (33527488).

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

25145840 is a wasteful number, since it uses less digits than its factorization.

25145840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137 (or 1131 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 25145840 is about 5014.5627925074. The cubic root of 25145840 is about 292.9692567541.

Adding to 25145840 its reverse (4854152), we get a palindrome (29999992).

The spelling of 25145840 in words is "twenty-five million, one hundred forty-five thousand, eight hundred forty".