261804242 has 16 divisors (see below), whose sum is σ = 455507520. Its totient is φ = 110526768.

The previous prime is 261804209. The next prime is 261804247. The reversal of 261804242 is 242408162.

It is a super-3 number, since 3×261804242³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (261804247) 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, 138617 + ... + 140492.

It is an arithmetic number, because the mean of its divisors is an integer number (28469220).

Almost surely, 2^261804242 is an apocalyptic number.

261804242 is a deficient number, since it is larger than the sum of its proper divisors (193703278).

261804242 is a wasteful number, since it uses less digits than its factorization.

261804242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279185.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 261804242 is about 16180.3659414736. The cubic root of 261804242 is about 639.7233846927.

The spelling of 261804242 in words is "two hundred sixty-one million, eight hundred four thousand, two hundred forty-two".