840139143 has 4 divisors (see below), whose sum is σ = 1120185528. Its totient is φ = 560092760.

The previous prime is 840139129. The next prime is 840139151. The reversal of 840139143 is 341931048.

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 840139143 - 2¹⁶ = 840073607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840139123) 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, 140023188 + ... + 140023193.

It is an arithmetic number, because the mean of its divisors is an integer number (280046382).

Almost surely, 2^840139143 is an apocalyptic number.

840139143 is a deficient number, since it is larger than the sum of its proper divisors (280046385).

840139143 is a wasteful number, since it uses less digits than its factorization.

840139143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280046384.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 840139143 is about 28985.1538377839. The cubic root of 840139143 is about 943.5908911309.

The spelling of 840139143 in words is "eight hundred forty million, one hundred thirty-nine thousand, one hundred forty-three".