139856 has 10 divisors (see below), whose sum is σ = 271002. Its totient is φ = 69920.

The previous prime is 139837. The next prime is 139861. The reversal of 139856 is 658931.

It can be written as a sum of positive squares in only one way, i.e., 99856 + 40000 = 316^2 + 200^2 .

It is a congruent number.

It is an unprimeable number.

139856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 4355 + ... + 4386.

2¹³⁹⁸⁵⁶ is an apocalyptic number.

139856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

139856 is a deficient number, since it is larger than the sum of its proper divisors (131146).

139856 is an equidigital number, since it uses as much as digits as its factorization.

139856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8749 (or 8743 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 139856 is about 373.9732610762. The cubic root of 139856 is about 51.9071320743.

The spelling of 139856 in words is "one hundred thirty-nine thousand, eight hundred fifty-six".