25421040 has 100 divisors (see below), whose sum is σ = 88313544. Its totient is φ = 6777216.

The previous prime is 25421027. The next prime is 25421059. The reversal of 25421040 is 4012452.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4519 + ... + 8441.

Almost surely, 2^25421040 is an apocalyptic number.

25421040 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 25421040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44156772).

25421040 is an abundant number, since it is smaller than the sum of its proper divisors (62892504).

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

25421040 is a wasteful number, since it uses less digits than its factorization.

25421040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3948 (or 3933 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 25421040 is about 5041.9282025828. The cubic root of 25421040 is about 294.0341484699.

Adding to 25421040 its reverse (4012452), we get a palindrome (29433492).

The spelling of 25421040 in words is "twenty-five million, four hundred twenty-one thousand, forty".