265941978 has 16 divisors (see below), whose sum is σ = 532176480. Its totient is φ = 88598576.

The previous prime is 265941967. The next prime is 265941979. The reversal of 265941978 is 879149562.

It is a self number, because there is not a number n which added to its sum of digits gives 265941978.

It is not an unprimeable number, because it can be changed into a prime (265941979) 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, 676 + ... + 23072.

It is an arithmetic number, because the mean of its divisors is an integer number (33261030).

Almost surely, 2^265941978 is an apocalyptic number.

265941978 is an abundant number, since it is smaller than the sum of its proper divisors (266234502).

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

265941978 is a wasteful number, since it uses less digits than its factorization.

265941978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24381.

The product of its digits is 1088640, while the sum is 51.

The square root of 265941978 is about 16307.7275547515. The cubic root of 265941978 is about 643.0759947492.

The spelling of 265941978 in words is "two hundred sixty-five million, nine hundred forty-one thousand, nine hundred seventy-eight".