840204891 has 24 divisors (see below), whose sum is σ = 1225442400. Its totient is φ = 554708736.

The previous prime is 840204851. The next prime is 840204913. The reversal of 840204891 is 198402048.

It is not a de Polignac number, because 840204891 - 2⁷ = 840204763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840204851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 579930 + ... + 581376.

It is an arithmetic number, because the mean of its divisors is an integer number (51060100).

Almost surely, 2^840204891 is an apocalyptic number.

840204891 is a deficient number, since it is larger than the sum of its proper divisors (385237509).

840204891 is a wasteful number, since it uses less digits than its factorization.

840204891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035 (or 2032 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 840204891 is about 28986.2879824237. The cubic root of 840204891 is about 943.6155051472.

The spelling of 840204891 in words is "eight hundred forty million, two hundred four thousand, eight hundred ninety-one".