25386240 has 144 divisors (see below), whose sum is σ = 88595136. Its totient is φ = 6144000.

The previous prime is 25386197. The next prime is 25386247. The reversal of 25386240 is 4268352.

It is a super-2 number, since 2×25386240² = 1288922362675200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25386198 and 25386207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25386247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41940 + ... + 42540.

It is an arithmetic number, because the mean of its divisors is an integer number (615244).

Almost surely, 2^25386240 is an apocalyptic number.

25386240 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 25386240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44297568).

25386240 is an abundant number, since it is smaller than the sum of its proper divisors (63208896).

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

25386240 is a wasteful number, since it uses less digits than its factorization.

25386240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 25386240 is about 5038.4759600498. The cubic root of 25386240 is about 293.8999150277.

It can be divided in two parts, 2538 and 6240, that added together give a palindrome (8778).

The spelling of 25386240 in words is "twenty-five million, three hundred eighty-six thousand, two hundred forty".