25219540 has 24 divisors (see below), whose sum is σ = 53062632. Its totient is φ = 10068480.

The previous prime is 25219511. The next prime is 25219549. The reversal of 25219540 is 4591252.

It can be written as a sum of positive squares in 4 ways, for example, as 478864 + 24740676 = 692^2 + 4974^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25219499 and 25219508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25219549) 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, 14392 + ... + 16048.

It is an arithmetic number, because the mean of its divisors is an integer number (2210943).

Almost surely, 2^25219540 is an apocalyptic number.

25219540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25219540 is an abundant number, since it is smaller than the sum of its proper divisors (27843092).

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

25219540 is a wasteful number, since it uses less digits than its factorization.

25219540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427 (or 2425 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 25219540 is about 5021.9060126609. The cubic root of 25219540 is about 293.2551990012.

The spelling of 25219540 in words is "twenty-five million, two hundred nineteen thousand, five hundred forty".