12735987 has 8 divisors (see below), whose sum is σ = 18525120. Its totient is φ = 7718760.

The previous prime is 12735979. The next prime is 12736019. The reversal of 12735987 is 78953721.

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

It is not a de Polignac number, because 12735987 - 2³ = 12735979 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12735937) 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 in 7 ways as a sum of consecutive naturals, for example, 192937 + ... + 193002.

It is an arithmetic number, because the mean of its divisors is an integer number (2315640).

Almost surely, 2^12735987 is an apocalyptic number.

12735987 is a deficient number, since it is larger than the sum of its proper divisors (5789133).

12735987 is a wasteful number, since it uses less digits than its factorization.

12735987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385953.

The product of its digits is 105840, while the sum is 42.

The square root of 12735987 is about 3568.7514623465. The cubic root of 12735987 is about 233.5308189753.

It can be divided in two parts, 1273 and 5987, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 12735987 in words is "twelve million, seven hundred thirty-five thousand, nine hundred eighty-seven".