261279439 has 8 divisors (see below), whose sum is σ = 275447808. Its totient is φ = 247469880.

The previous prime is 261279437. The next prime is 261279449. The reversal of 261279439 is 934972162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261279439 - 2¹ = 261279437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261279395 and 261279404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261279433) 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, 88207 + ... + 91120.

It is an arithmetic number, because the mean of its divisors is an integer number (34430976).

Almost surely, 2^261279439 is an apocalyptic number.

261279439 is a deficient number, since it is larger than the sum of its proper divisors (14168369).

261279439 is a wasteful number, since it uses less digits than its factorization.

261279439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179405.

The product of its digits is 163296, while the sum is 43.

The square root of 261279439 is about 16164.1405277237. The cubic root of 261279439 is about 639.2956435570.

The spelling of 261279439 in words is "two hundred sixty-one million, two hundred seventy-nine thousand, four hundred thirty-nine".