139816 has 8 divisors (see below), whose sum is σ = 262170. Its totient is φ = 69904.

The previous prime is 139813. The next prime is 139831. The reversal of 139816 is 618931.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 2916 = 370^2 + 54^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (139813) 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 as a sum of consecutive naturals, namely, 8731 + ... + 8746.

2¹³⁹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

139816 is a deficient number, since it is larger than the sum of its proper divisors (122354).

139816 is a wasteful number, since it uses less digits than its factorization.

139816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17483 (or 17479 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 139816 is about 373.9197774924. The cubic root of 139816 is about 51.9021829760.

The spelling of 139816 in words is "one hundred thirty-nine thousand, eight hundred sixteen".