265853440 has 80 divisors (see below), whose sum is σ = 659589480. Its totient is φ = 102645760.

The previous prime is 265853437. The next prime is 265853443. The reversal of 265853440 is 44358562.

It is an interprime number because it is at equal distance from previous prime (265853437) and next prime (265853443).

It can be written as a sum of positive squares in 4 ways, for example, as 252428544 + 13424896 = 15888^2 + 3664^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 265853440.

It is not an unprimeable number, because it can be changed into a prime (265853443) 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, 72450 + ... + 76030.

Almost surely, 2^265853440 is an apocalyptic number.

265853440 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 265853440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329794740).

265853440 is an abundant number, since it is smaller than the sum of its proper divisors (393736040).

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

265853440 is an equidigital number, since it uses as much as digits as its factorization.

265853440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3633 (or 3617 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The square root of 265853440 is about 16305.0127261527. The cubic root of 265853440 is about 643.0046220604.

The spelling of 265853440 in words is "two hundred sixty-five million, eight hundred fifty-three thousand, four hundred forty".