139786 has 8 divisors (see below), whose sum is σ = 215460. Its totient is φ = 67968.

The previous prime is 139759. The next prime is 139787. The reversal of 139786 is 687931.

It can be written as a sum of positive squares in 2 ways, for example, as 133225 + 6561 = 365^2 + 81^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (139787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871 + ... + 1018.

2¹³⁹⁷⁸⁶ is an apocalyptic number.

139786 is a deficient number, since it is larger than the sum of its proper divisors (75674).

139786 is a wasteful number, since it uses less digits than its factorization.

139786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928.

The product of its digits is 9072, while the sum is 34.

The square root of 139786 is about 373.8796597837. The cubic root of 139786 is about 51.8984705328.

The spelling of 139786 in words is "one hundred thirty-nine thousand, seven hundred eighty-six".