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142989 = 3711619
BaseRepresentation
bin100010111010001101
321021010220
4202322031
514033424
63021553
71133610
oct427215
9237126
10142989
1198480
126a8b9
1350112
143a177
152c579
hex22e8d

142989 has 16 divisors (see below), whose sum is σ = 238080. Its totient is φ = 74160.

The previous prime is 142981. The next prime is 142993. The reversal of 142989 is 989241.

It can be divided in two parts, 14 and 2989, that added together give a palindrome (3003).

142989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 142989 - 23 = 142981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79 + ... + 540.

It is an arithmetic number, because the mean of its divisors is an integer number (14880).

2142989 is an apocalyptic number.

It is an amenable number.

142989 is a deficient number, since it is larger than the sum of its proper divisors (95091).

142989 is a wasteful number, since it uses less digits than its factorization.

142989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640.

The product of its digits is 5184, while the sum is 33.

The square root of 142989 is about 378.1388633822. The cubic root of 142989 is about 52.2918744315.

The spelling of 142989 in words is "one hundred forty-two thousand, nine hundred eighty-nine".

Divisors: 1 3 7 11 21 33 77 231 619 1857 4333 6809 12999 20427 47663 142989