25415040 has 256 divisors, whose sum is σ = 97136640. Its totient is φ = 5529600.

The previous prime is 25415029. The next prime is 25415053. The reversal of 25415040 is 4051452.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 25414998 and 25415016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 416610 + ... + 416670.

It is an arithmetic number, because the mean of its divisors is an integer number (379440).

Almost surely, 2^25415040 is an apocalyptic number.

25415040 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 25415040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48568320).

25415040 is an abundant number, since it is smaller than the sum of its proper divisors (71721600).

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

25415040 is a wasteful number, since it uses less digits than its factorization.

25415040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 25415040 is about 5041.3331570131. Note that the first 3 decimals coincide. The cubic root of 25415040 is about 294.0110135168.

Adding to 25415040 its reverse (4051452), we get a palindrome (29466492).

The spelling of 25415040 in words is "twenty-five million, four hundred fifteen thousand, forty".