105579987 has 4 divisors (see below), whose sum is σ = 140773320. Its totient is φ = 70386656.

The previous prime is 105579967. The next prime is 105580021. The reversal of 105579987 is 789975501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 105579987 - 2⁸ = 105579731 is a prime.

It is a super-2 number, since 2×105579987² = 22294267309840338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (105579967) 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 3 ways as a sum of consecutive naturals, for example, 17596662 + ... + 17596667.

It is an arithmetic number, because the mean of its divisors is an integer number (35193330).

Almost surely, 2^105579987 is an apocalyptic number.

105579987 is a deficient number, since it is larger than the sum of its proper divisors (35193333).

105579987 is an equidigital number, since it uses as much as digits as its factorization.

105579987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35193332.

The product of its (nonzero) digits is 793800, while the sum is 51.

The square root of 105579987 is about 10275.2122605813. The cubic root of 105579987 is about 472.6364388603.

The spelling of 105579987 in words is "one hundred five million, five hundred seventy-nine thousand, nine hundred eighty-seven".