12105487 has 4 divisors (see below), whose sum is σ = 12223120. Its totient is φ = 11987856.

The previous prime is 12105463. The next prime is 12105491. The reversal of 12105487 is 78450121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78450121 = 17 ⋅4614713.

It is a cyclic number.

It is not a de Polignac number, because 12105487 - 2²³ = 3716879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58662 + ... + 58867.

It is an arithmetic number, because the mean of its divisors is an integer number (3055780).

Almost surely, 2^12105487 is an apocalyptic number.

12105487 is a deficient number, since it is larger than the sum of its proper divisors (117633).

12105487 is a wasteful number, since it uses less digits than its factorization.

12105487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117632.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 12105487 is about 3479.2940375887. The cubic root of 12105487 is about 229.6117394051.

The spelling of 12105487 in words is "twelve million, one hundred five thousand, four hundred eighty-seven".