105589987 has 6 divisors (see below), whose sum is σ = 110381012. Its totient is φ = 100998612.

The previous prime is 105589969. The next prime is 105590003. The reversal of 105589987 is 789985501.

It is not a de Polignac number, because 105589987 - 2¹¹ = 105587939 is a prime.

It is a super-2 number, since 2×105589987² = 22298490709320338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105589487) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99273 + ... + 100330.

Almost surely, 2^105589987 is an apocalyptic number.

105589987 is a deficient number, since it is larger than the sum of its proper divisors (4791025).

105589987 is an equidigital number, since it uses as much as digits as its factorization.

105589987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199649 (or 199626 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 52.

The square root of 105589987 is about 10275.6988570121. The cubic root of 105589987 is about 472.6513602967.

The spelling of 105589987 in words is "one hundred five million, five hundred eighty-nine thousand, nine hundred eighty-seven".