840516431 has 4 divisors (see below), whose sum is σ = 889958592. Its totient is φ = 791074272.

The previous prime is 840516427. The next prime is 840516437. The reversal of 840516431 is 134615048.

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 840516431 - 2² = 840516427 is a prime.

It is a super-2 number, since 2×840516431² = 1412935741561955522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840516437) 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, 24721055 + ... + 24721088.

It is an arithmetic number, because the mean of its divisors is an integer number (222489648).

Almost surely, 2^840516431 is an apocalyptic number.

840516431 is a deficient number, since it is larger than the sum of its proper divisors (49442161).

840516431 is a wasteful number, since it uses less digits than its factorization.

840516431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49442160.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 840516431 is about 28991.6614046177. The cubic root of 840516431 is about 943.7321186267.

The spelling of 840516431 in words is "eight hundred forty million, five hundred sixteen thousand, four hundred thirty-one".