821423827 has 8 divisors (see below), whose sum is σ = 988179200. Its totient is φ = 667020744.

The previous prime is 821423821. The next prime is 821423831. The reversal of 821423827 is 728324128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 821423827 - 2¹⁵ = 821391059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821423821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3087927 + ... + 3088192.

It is an arithmetic number, because the mean of its divisors is an integer number (123522400).

Almost surely, 2^821423827 is an apocalyptic number.

821423827 is a deficient number, since it is larger than the sum of its proper divisors (166755373).

821423827 is a wasteful number, since it uses less digits than its factorization.

821423827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6176145.

The product of its digits is 43008, while the sum is 37.

The square root of 821423827 is about 28660.4924416870. The cubic root of 821423827 is about 936.5315921757.

It can be divided in two parts, 8214 and 23827, that added together give a square (32041 = 179²).

The spelling of 821423827 in words is "eight hundred twenty-one million, four hundred twenty-three thousand, eight hundred twenty-seven".