142640 has 20 divisors (see below), whose sum is σ = 331824. Its totient is φ = 57024.

The previous prime is 142619. The next prime is 142657. The reversal of 142640 is 46241.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

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, 812 + ... + 971.

2¹⁴²⁶⁴⁰ is an apocalyptic number.

142640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142640 is an abundant number, since it is smaller than the sum of its proper divisors (189184).

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

142640 is a wasteful number, since it uses less digits than its factorization.

142640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796 (or 1790 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 142640 is about 377.6771107706. The cubic root of 142640 is about 52.2492960231.

Adding to 142640 its reverse (46241), we get a palindrome (188881).

The spelling of 142640 in words is "one hundred forty-two thousand, six hundred forty".