25211440 has 40 divisors (see below), whose sum is σ = 60643440. Its totient is φ = 9735936.

The previous prime is 25211429. The next prime is 25211449. The reversal of 25211440 is 4411252.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (25211449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3114 + ... + 7753.

It is an arithmetic number, because the mean of its divisors is an integer number (1516086).

Almost surely, 2^25211440 is an apocalyptic number.

25211440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25211440 is an abundant number, since it is smaller than the sum of its proper divisors (35432000).

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

25211440 is a wasteful number, since it uses less digits than its factorization.

25211440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10909 (or 10903 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 25211440 is about 5021.0994811894. The cubic root of 25211440 is about 293.2237997837.

Adding to 25211440 its reverse (4411252), we get a palindrome (29622692).

It can be divided in two parts, 25211 and 440, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 25211440 in words is "twenty-five million, two hundred eleven thousand, four hundred forty".