260387986 has 4 divisors (see below), whose sum is σ = 390581982. Its totient is φ = 130193992.

The previous prime is 260387977. The next prime is 260387987. The reversal of 260387986 is 689783062.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689783062 = 2 ⋅344891531.

It can be written as a sum of positive squares in only one way, i.e., 135373225 + 125014761 = 11635^2 + 11181^2 .

It is not an unprimeable number, because it can be changed into a prime (260387987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65096995 + ... + 65096998.

Almost surely, 2^260387986 is an apocalyptic number.

260387986 is a deficient number, since it is larger than the sum of its proper divisors (130193996).

260387986 is a wasteful number, since it uses less digits than its factorization.

260387986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130193995.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 260387986 is about 16136.5419467741. The cubic root of 260387986 is about 638.5677493175.

The spelling of 260387986 in words is "two hundred sixty million, three hundred eighty-seven thousand, nine hundred eighty-six".