854640891 has 48 divisors (see below), whose sum is σ = 1386508032. Its totient is φ = 503712000.

The previous prime is 854640883. The next prime is 854640893. The reversal of 854640891 is 198046458.

It is not a de Polignac number, because 854640891 - 2³ = 854640883 is a prime.

It is a super-2 number, since 2×854640891² = 1460822105138547762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (854640893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 365161 + ... + 367493.

It is an arithmetic number, because the mean of its divisors is an integer number (28885584).

Almost surely, 2^854640891 is an apocalyptic number.

854640891 is a deficient number, since it is larger than the sum of its proper divisors (531867141).

854640891 is a wasteful number, since it uses less digits than its factorization.

854640891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484 (or 2481 counting only the distinct ones).

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

The square root of 854640891 is about 29234.2417551747. The cubic root of 854640891 is about 948.9890967852.

The spelling of 854640891 in words is "eight hundred fifty-four million, six hundred forty thousand, eight hundred ninety-one".