105381987 has 4 divisors (see below), whose sum is σ = 140509320. Its totient is φ = 70254656.

The previous prime is 105381979. The next prime is 105382009. The reversal of 105381987 is 789183501.

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 105381987 - 2³ = 105381979 is a prime.

It is a super-2 number, since 2×105381987² = 22210726368136338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (105381977) 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, 17563662 + ... + 17563667.

It is an arithmetic number, because the mean of its divisors is an integer number (35127330).

Almost surely, 2^105381987 is an apocalyptic number.

105381987 is a deficient number, since it is larger than the sum of its proper divisors (35127333).

105381987 is an equidigital number, since it uses as much as digits as its factorization.

105381987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35127332.

The product of its (nonzero) digits is 60480, while the sum is 42.

The square root of 105381987 is about 10265.5729016943. The cubic root of 105381987 is about 472.3408002062.

The spelling of 105381987 in words is "one hundred five million, three hundred eighty-one thousand, nine hundred eighty-seven".