840654891 has 6 divisors (see below), whose sum is σ = 1214279300. Its totient is φ = 560436588.

The previous prime is 840654877. The next prime is 840654917. The reversal of 840654891 is 198456048.

It is not a de Polignac number, because 840654891 - 2¹³ = 840646699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840654851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46703041 + ... + 46703058.

Almost surely, 2^840654891 is an apocalyptic number.

840654891 is a deficient number, since it is larger than the sum of its proper divisors (373624409).

840654891 is a wasteful number, since it uses less digits than its factorization.

840654891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93406105 (or 93406102 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 840654891 is about 28994.0492342825. The cubic root of 840654891 is about 943.7839367590.

The spelling of 840654891 in words is "eight hundred forty million, six hundred fifty-four thousand, eight hundred ninety-one".