25121340 has 84 divisors (see below), whose sum is σ = 79141944. Its totient is φ = 6695136.

The previous prime is 25121323. The next prime is 25121347. The reversal of 25121340 is 4312152.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25121347) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 13719 + ... + 15441.

It is an arithmetic number, because the mean of its divisors is an integer number (942166).

Almost surely, 2^25121340 is an apocalyptic number.

25121340 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 25121340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39570972).

25121340 is an abundant number, since it is smaller than the sum of its proper divisors (54020604).

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

25121340 is a wasteful number, since it uses less digits than its factorization.

25121340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750 (or 1733 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 25121340 is about 5012.1193122271. The cubic root of 25121340 is about 292.8740776021.

Adding to 25121340 its reverse (4312152), we get a palindrome (29433492).

The spelling of 25121340 in words is "twenty-five million, one hundred twenty-one thousand, three hundred forty".