261838338 has 32 divisors (see below), whose sum is σ = 550789632. Its totient is φ = 82867200.

The previous prime is 261838337. The next prime is 261838387. The reversal of 261838338 is 833838162.

261838338 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261838338.

It is not an unprimeable number, because it can be changed into a prime (261838337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3423 + ... + 23138.

It is an arithmetic number, because the mean of its divisors is an integer number (17212176).

Almost surely, 2^261838338 is an apocalyptic number.

261838338 is an abundant number, since it is smaller than the sum of its proper divisors (288951294).

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

261838338 is a wasteful number, since it uses less digits than its factorization.

261838338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26650.

The product of its digits is 165888, while the sum is 42.

The square root of 261838338 is about 16181.4195298188. The cubic root of 261838338 is about 639.7511548841.

The spelling of 261838338 in words is "two hundred sixty-one million, eight hundred thirty-eight thousand, three hundred thirty-eight".