25121040 has 160 divisors (see below), whose sum is σ = 93803520. Its totient is φ = 5432832.

The previous prime is 25121011. The next prime is 25121093. The reversal of 25121040 is 4012152.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 31527 + ... + 32313.

It is an arithmetic number, because the mean of its divisors is an integer number (586272).

Almost surely, 2^25121040 is an apocalyptic number.

25121040 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 25121040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46901760).

25121040 is an abundant number, since it is smaller than the sum of its proper divisors (68682480).

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

25121040 is a wasteful number, since it uses less digits than its factorization.

25121040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 25121040 is about 5012.0893846778. The cubic root of 25121040 is about 292.8729117596.

Adding to 25121040 its reverse (4012152), we get a palindrome (29133192).

The spelling of 25121040 in words is "twenty-five million, one hundred twenty-one thousand, forty".