139442 has 8 divisors (see below), whose sum is σ = 211356. Its totient is φ = 68992.

The previous prime is 139439. The next prime is 139457. The reversal of 139442 is 244931.

139442 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 2 ways, for example, as 90601 + 48841 = 301^2 + 221^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83 + ... + 534.

2¹³⁹⁴⁴² is an apocalyptic number.

139442 is a deficient number, since it is larger than the sum of its proper divisors (71914).

139442 is a wasteful number, since it uses less digits than its factorization.

139442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732.

The product of its digits is 864, while the sum is 23.

The square root of 139442 is about 373.4193353323. The cubic root of 139442 is about 51.8558631691.

The spelling of 139442 in words is "one hundred thirty-nine thousand, four hundred forty-two".