840434871 has 16 divisors (see below), whose sum is σ = 1171044864. Its totient is φ = 535612224.

The previous prime is 840434867. The next prime is 840434887. The reversal of 840434871 is 178434048.

It is not a de Polignac number, because 840434871 - 2² = 840434867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840434071) 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, 63246 + ... + 75371.

It is an arithmetic number, because the mean of its divisors is an integer number (73190304).

Almost surely, 2^840434871 is an apocalyptic number.

840434871 is a deficient number, since it is larger than the sum of its proper divisors (330609993).

840434871 is a wasteful number, since it uses less digits than its factorization.

840434871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138710.

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 840434871 is about 28990.2547591428. The cubic root of 840434871 is about 943.7015924413.

It can be divided in two parts, 840 and 434871, that added together give a triangular number (435711 = T₉₃₃).

The spelling of 840434871 in words is "eight hundred forty million, four hundred thirty-four thousand, eight hundred seventy-one".