139722 has 32 divisors (see below), whose sum is σ = 319680. Its totient is φ = 40320.

The previous prime is 139721. The next prime is 139729. The reversal of 139722 is 227931.

Added to its reverse (227931) it gives a triangular number (367653 = T₈₅₇).

It is a junction number, because it is equal to n+sod(n) for n = 139692 and 139701.

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 15 ways as a sum of consecutive naturals, for example, 1878 + ... + 1950.

It is an arithmetic number, because the mean of its divisors is an integer number (9990).

2¹³⁹⁷²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159840).

139722 is an abundant number, since it is smaller than the sum of its proper divisors (179958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139722 is a wasteful number, since it uses less digits than its factorization.

139722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118.

The product of its digits is 756, while the sum is 24.

The square root of 139722 is about 373.7940609480. The cubic root of 139722 is about 51.8905488784.

Adding to 139722 its reverse (227931), we get a triangular number (367653 = T₈₅₇).

Subtracting 139722 from its reverse (227931), we obtain a square (88209 = 297²).

It can be divided in two parts, 139 and 722, that added together give a triangular number (861 = T₄₁).

The spelling of 139722 in words is "one hundred thirty-nine thousand, seven hundred twenty-two".