25847440 has 20 divisors (see below), whose sum is σ = 60095484. Its totient is φ = 10338944.

The previous prime is 25847413. The next prime is 25847447. The reversal of 25847440 is 4474852.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5308416 + 20539024 = 2304^2 + 4532^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 25847396 and 25847405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25847447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161467 + ... + 161626.

Almost surely, 2^25847440 is an apocalyptic number.

25847440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25847440 is an abundant number, since it is smaller than the sum of its proper divisors (34248044).

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

25847440 is a wasteful number, since it uses less digits than its factorization.

25847440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323106 (or 323100 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 25847440 is about 5084.0377653987. The cubic root of 25847440 is about 295.6690359722.

The spelling of 25847440 in words is "twenty-five million, eight hundred forty-seven thousand, four hundred forty".