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142387 = 720341
BaseRepresentation
bin100010110000110011
321020022121
4202300303
514024022
63015111
71132060
oct426063
9236277
10142387
1197a83
126a497
134ca6b
1439c67
152c2c7
hex22c33

142387 has 4 divisors (see below), whose sum is σ = 162736. Its totient is φ = 122040.

The previous prime is 142381. The next prime is 142391. The reversal of 142387 is 783241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 783241 = 1746073.

It is a cyclic number.

It is not a de Polignac number, because 142387 - 211 = 140339 is a prime.

142387 is a lucky 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 3 ways as a sum of consecutive naturals, for example, 10164 + ... + 10177.

It is an arithmetic number, because the mean of its divisors is an integer number (40684).

2142387 is an apocalyptic number.

142387 is a deficient number, since it is larger than the sum of its proper divisors (20349).

142387 is an equidigital number, since it uses as much as digits as its factorization.

142387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20348.

The product of its digits is 1344, while the sum is 25.

The square root of 142387 is about 377.3420199236. The cubic root of 142387 is about 52.2183862850.

It can be divided in two parts, 142 and 387, that added together give a square (529 = 232).

The spelling of 142387 in words is "one hundred forty-two thousand, three hundred eighty-seven".

Divisors: 1 7 20341 142387