139724 has 12 divisors (see below), whose sum is σ = 263424. Its totient is φ = 64464.

The previous prime is 139721. The next prime is 139729. The reversal of 139724 is 427931.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 139693 and 139702.

It is not an unprimeable number, because it can be changed into a prime (139721) 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 in 3 ways as a sum of consecutive naturals, for example, 1292 + ... + 1395.

It is an arithmetic number, because the mean of its divisors is an integer number (21952).

2¹³⁹⁷²⁴ is an apocalyptic number.

It is an amenable number.

139724 is a deficient number, since it is larger than the sum of its proper divisors (123700).

139724 is a wasteful number, since it uses less digits than its factorization.

139724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704 (or 2702 counting only the distinct ones).

The product of its digits is 1512, while the sum is 26.

The square root of 139724 is about 373.7967362083. The cubic root of 139724 is about 51.8907964667.

The spelling of 139724 in words is "one hundred thirty-nine thousand, seven hundred twenty-four".