265401240 has 128 divisors (see below), whose sum is σ = 871819200. Its totient is φ = 64235520.

The previous prime is 265401239. The next prime is 265401277. The reversal of 265401240 is 42104562.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 265401240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93766 + ... + 96554.

Almost surely, 2^265401240 is an apocalyptic number.

265401240 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 265401240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (435909600).

265401240 is an abundant number, since it is smaller than the sum of its proper divisors (606417960).

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

265401240 is a wasteful number, since it uses less digits than its factorization.

265401240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2877 (or 2873 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 265401240 is about 16291.1399232835. The cubic root of 265401240 is about 642.6398450055.

The spelling of 265401240 in words is "two hundred sixty-five million, four hundred one thousand, two hundred forty".