75686139 has 12 divisors (see below), whose sum is σ = 115078600. Its totient is φ = 47801664.

The previous prime is 75686137. The next prime is 75686141. The reversal of 75686139 is 93168657.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (75686137) and next prime (75686141).

It is not a de Polignac number, because 75686139 - 2¹ = 75686137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75686094 and 75686103.

It is not an unprimeable number, because it can be changed into a prime (75686137) 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 11 ways as a sum of consecutive naturals, for example, 221134 + ... + 221475.

Almost surely, 2^75686139 is an apocalyptic number.

75686139 is a deficient number, since it is larger than the sum of its proper divisors (39392461).

75686139 is a wasteful number, since it uses less digits than its factorization.

75686139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442634 (or 442631 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 75686139 is about 8699.7781006184. The cubic root of 75686139 is about 422.9984574831.

It can be divided in two parts, 756861 and 39, that added together give a square (756900 = 870²).

The spelling of 75686139 in words is "seventy-five million, six hundred eighty-six thousand, one hundred thirty-nine".