142639 has 12 divisors (see below), whose sum is σ = 172368. Its totient is φ = 117600.

The previous prime is 142619. The next prime is 142657. The reversal of 142639 is 936241.

It is not a de Polignac number, because 142639 - 2⁵ = 142607 is a prime.

142639 is a modest number, since divided by 639 gives 142 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1974 + ... + 2044.

It is an arithmetic number, because the mean of its divisors is an integer number (14364).

2¹⁴²⁶³⁹ is an apocalyptic number.

142639 is a deficient number, since it is larger than the sum of its proper divisors (29729).

142639 is an equidigital number, since it uses as much as digits as its factorization.

142639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 119 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

The square root of 142639 is about 377.6757868861. The cubic root of 142639 is about 52.2491739222.

The spelling of 142639 in words is "one hundred forty-two thousand, six hundred thirty-nine".