139522 has 4 divisors (see below), whose sum is σ = 209286. Its totient is φ = 69760.

The previous prime is 139511. The next prime is 139537. The reversal of 139522 is 225931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 103041 + 36481 = 321^2 + 191^2 .

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 3⁵ + 5 + 9 + 2¹³ + 2¹⁷ .

It is a plaindrome in base 12 and base 14.

It is a junction number, because it is equal to n+sod(n) for n = 139493 and 139502.

It is an unprimeable number.

139522 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34879 + ... + 34882.

2¹³⁹⁵²² is an apocalyptic number.

139522 is a deficient number, since it is larger than the sum of its proper divisors (69764).

139522 is an equidigital number, since it uses as much as digits as its factorization.

139522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69763.

The product of its digits is 540, while the sum is 22.

The square root of 139522 is about 373.5264381540. The cubic root of 139522 is about 51.8657781062.

The spelling of 139522 in words is "one hundred thirty-nine thousand, five hundred twenty-two".