75986 has 4 divisors (see below), whose sum is σ = 113982. Its totient is φ = 37992.

The previous prime is 75983. The next prime is 75989. The reversal of 75986 is 68957.

75986 = 74² + 75² + ... + 85².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68957 = 7 ⋅9851.

It is an interprime number because it is at equal distance from previous prime (75983) and next prime (75989).

It can be written as a sum of positive squares in only one way, i.e., 75625 + 361 = 275^2 + 19^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (75983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18995 + ... + 18998.

2⁷⁵⁹⁸⁶ is an apocalyptic number.

75986 is a deficient number, since it is larger than the sum of its proper divisors (37996).

75986 is a wasteful number, since it uses less digits than its factorization.

75986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37995.

The product of its digits is 15120, while the sum is 35.

The square root of 75986 is about 275.6555822036. The cubic root of 75986 is about 42.3556347385.

The spelling of 75986 in words is "seventy-five thousand, nine hundred eighty-six".