105387987 has 6 divisors (see below), whose sum is σ = 140541028. Its totient is φ = 70246804.

The previous prime is 105387937. The next prime is 105387991. The reversal of 105387987 is 789783501.

It is not a de Polignac number, because 105387987 - 2⁶ = 105387923 is a prime.

It is a super-2 number, since 2×105387987² = 22213255607824338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105387907) 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 5 ways as a sum of consecutive naturals, for example, 14818 + ... + 20744.

Almost surely, 2^105387987 is an apocalyptic number.

105387987 is a deficient number, since it is larger than the sum of its proper divisors (35153041).

105387987 is an frugal number, since it uses more digits than its factorization.

105387987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11857 (or 5930 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 48.

The square root of 105387987 is about 10265.8651364607. The cubic root of 105387987 is about 472.3497643916.

Multiplying 105387987 by its sum of digits (48), we get a square (5058623376 = 71124²).

The spelling of 105387987 in words is "one hundred five million, three hundred eighty-seven thousand, nine hundred eighty-seven".