265704138 has 80 divisors (see below), whose sum is σ = 696379200. Its totient is φ = 74136384.

The previous prime is 265704133. The next prime is 265704143. The reversal of 265704138 is 831407562.

It is an interprime number because it is at equal distance from previous prime (265704133) and next prime (265704143).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (265704133) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 46038 + ... + 51486.

It is an arithmetic number, because the mean of its divisors is an integer number (8704740).

Almost surely, 2^265704138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265704138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348189600).

265704138 is an abundant number, since it is smaller than the sum of its proper divisors (430675062).

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

265704138 is a wasteful number, since it uses less digits than its factorization.

265704138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5513 (or 5504 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 265704138 is about 16300.4336752124. The cubic root of 265704138 is about 642.8842300967.

The spelling of 265704138 in words is "two hundred sixty-five million, seven hundred four thousand, one hundred thirty-eight".