12861505 has 16 divisors (see below), whose sum is σ = 15813504. Its totient is φ = 10039680.

The previous prime is 12861493. The next prime is 12861517. The reversal of 12861505 is 50516821.

It is an interprime number because it is at equal distance from previous prime (12861493) and next prime (12861517).

It is not a de Polignac number, because 12861505 - 2⁷ = 12861377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60850 + ... + 61060.

It is an arithmetic number, because the mean of its divisors is an integer number (988344).

Almost surely, 2^12861505 is an apocalyptic number.

It is an amenable number.

12861505 is a deficient number, since it is larger than the sum of its proper divisors (2951999).

12861505 is a wasteful number, since it uses less digits than its factorization.

12861505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 12861505 is about 3586.2940481784. The cubic root of 12861505 is about 234.2954907785.

It can be divided in two parts, 12861 and 505, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 12861505 in words is "twelve million, eight hundred sixty-one thousand, five hundred five".