138142843 has 4 divisors (see below), whose sum is σ = 138180688. Its totient is φ = 138105000.

The previous prime is 138142831. The next prime is 138142871. The reversal of 138142843 is 348241831.

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

It is a cyclic number.

It is not a de Polignac number, because 138142843 - 2¹³ = 138134651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138142799 and 138142808.

It is not an unprimeable number, because it can be changed into a prime (138142813) 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, 12783 + ... + 20968.

It is an arithmetic number, because the mean of its divisors is an integer number (34545172).

Almost surely, 2^138142843 is an apocalyptic number.

138142843 is a deficient number, since it is larger than the sum of its proper divisors (37845).

138142843 is an equidigital number, since it uses as much as digits as its factorization.

138142843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37844.

The product of its digits is 18432, while the sum is 34.

The square root of 138142843 is about 11753.4183538237. The cubic root of 138142843 is about 516.9431638787.

The spelling of 138142843 in words is "one hundred thirty-eight million, one hundred forty-two thousand, eight hundred forty-three".