265943988 has 72 divisors (see below), whose sum is σ = 749286720. Its totient is φ = 79038720.

The previous prime is 265943987. The next prime is 265944011. The reversal of 265943988 is 889349562.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265943987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193 + ... + 23063.

It is an arithmetic number, because the mean of its divisors is an integer number (10406760).

Almost surely, 2^265943988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265943988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374643360).

265943988 is an abundant number, since it is smaller than the sum of its proper divisors (483342732).

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

265943988 is a wasteful number, since it uses less digits than its factorization.

265943988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22917 (or 22912 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 265943988 is about 16307.7891818603. The cubic root of 265943988 is about 643.0776148764.

The spelling of 265943988 in words is "two hundred sixty-five million, nine hundred forty-three thousand, nine hundred eighty-eight".