142909 has 4 divisors (see below), whose sum is σ = 153916. Its totient is φ = 131904.

The previous prime is 142907. The next prime is 142939. The reversal of 142909 is 909241.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22500 + 120409 = 150^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 142909 - 2¹ = 142907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5484 + ... + 5509.

It is an arithmetic number, because the mean of its divisors is an integer number (38479).

2¹⁴²⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

142909 is a deficient number, since it is larger than the sum of its proper divisors (11007).

142909 is a wasteful number, since it uses less digits than its factorization.

142909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11006.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 142909 is about 378.0330673367. The cubic root of 142909 is about 52.2821204636.

Subtracting from 142909 its sum of digits (25), we obtain a square (142884 = 378²).

The spelling of 142909 in words is "one hundred forty-two thousand, nine hundred nine".