25249940 has 24 divisors (see below), whose sum is σ = 53139240. Its totient is φ = 10078208.

The previous prime is 25249937. The next prime is 25249957. The reversal of 25249940 is 4994252.

It can be written as a sum of positive squares in 4 ways, for example, as 1552516 + 23697424 = 1246^2 + 4868^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25249940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10796 + ... + 12924.

It is an arithmetic number, because the mean of its divisors is an integer number (2214135).

Almost surely, 2^25249940 is an apocalyptic number.

25249940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25249940 is an abundant number, since it is smaller than the sum of its proper divisors (27889300).

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

25249940 is a wasteful number, since it uses less digits than its factorization.

25249940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731 (or 2729 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 25249940 is about 5024.9318403338. The cubic root of 25249940 is about 293.3729830471.

The spelling of 25249940 in words is "twenty-five million, two hundred forty-nine thousand, nine hundred forty".