821894454 has 24 divisors (see below), whose sum is σ = 1782337752. Its totient is φ = 273723840.

The previous prime is 821894449. The next prime is 821894467. The reversal of 821894454 is 454498128.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1582 + ... + 40574.

It is an arithmetic number, because the mean of its divisors is an integer number (74264073).

Almost surely, 2^821894454 is an apocalyptic number.

821894454 is an abundant number, since it is smaller than the sum of its proper divisors (960443298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821894454 is a wasteful number, since it uses less digits than its factorization.

821894454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40172 (or 40169 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 821894454 is about 28668.7016448251. The cubic root of 821894454 is about 936.7104169960.

The spelling of 821894454 in words is "eight hundred twenty-one million, eight hundred ninety-four thousand, four hundred fifty-four".