821724954 has 16 divisors (see below), whose sum is σ = 1740123648. Its totient is φ = 257796032.

The previous prime is 821724931. The next prime is 821724989. The reversal of 821724954 is 459427128.

821724954 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4027962 + ... + 4028165.

It is an arithmetic number, because the mean of its divisors is an integer number (108757728).

Almost surely, 2^821724954 is an apocalyptic number.

821724954 is an abundant number, since it is smaller than the sum of its proper divisors (918398694).

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

821724954 is a wasteful number, since it uses less digits than its factorization.

821724954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8056149.

The product of its digits is 161280, while the sum is 42.

The square root of 821724954 is about 28665.7453068990. The cubic root of 821724954 is about 936.6460197039.

The spelling of 821724954 in words is "eight hundred twenty-one million, seven hundred twenty-four thousand, nine hundred fifty-four".