142389 has 12 divisors (see below), whose sum is σ = 221676. Its totient is φ = 87552.

The previous prime is 142381. The next prime is 142391. The reversal of 142389 is 983241.

It can be written as a sum of positive squares in 2 ways, for example, as 33489 + 108900 = 183^2 + 330^2 .

It is not a de Polignac number, because 142389 - 2³ = 142381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142381) 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, 492 + ... + 725.

It is an arithmetic number, because the mean of its divisors is an integer number (18473).

2¹⁴²³⁸⁹ is an apocalyptic number.

It is an amenable number.

142389 is a deficient number, since it is larger than the sum of its proper divisors (79287).

142389 is a wasteful number, since it uses less digits than its factorization.

142389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236 (or 1233 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 142389 is about 377.3446700299. The cubic root of 142389 is about 52.2186307743.

The spelling of 142389 in words is "one hundred forty-two thousand, three hundred eighty-nine".