260406861 has 48 divisors (see below), whose sum is σ = 418364352. Its totient is φ = 142771200.

The previous prime is 260406857. The next prime is 260406871. The reversal of 260406861 is 168604062.

It is a happy number.

It is not a de Polignac number, because 260406861 - 2² = 260406857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260406821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 295141 + ... + 296021.

It is an arithmetic number, because the mean of its divisors is an integer number (8715924).

Almost surely, 2^260406861 is an apocalyptic number.

It is an amenable number.

260406861 is a deficient number, since it is larger than the sum of its proper divisors (157957491).

260406861 is a wasteful number, since it uses less digits than its factorization.

260406861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974 (or 961 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 260406861 is about 16137.1267888680. The cubic root of 260406861 is about 638.5831784408.

The spelling of 260406861 in words is "two hundred sixty million, four hundred six thousand, eight hundred sixty-one".