842926821 has 8 divisors (see below), whose sum is σ = 1226075424. Its totient is φ = 510864720.

The previous prime is 842926817. The next prime is 842926829. The reversal of 842926821 is 128629248.

842926821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 842926821 - 2² = 842926817 is a prime.

It is a super-2 number, since 2×842926821² = 1421051251122332082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842926829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12771586 + ... + 12771651.

It is an arithmetic number, because the mean of its divisors is an integer number (153259428).

Almost surely, 2^842926821 is an apocalyptic number.

It is an amenable number.

842926821 is a deficient number, since it is larger than the sum of its proper divisors (383148603).

842926821 is a wasteful number, since it uses less digits than its factorization.

842926821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25543251.

The product of its digits is 110592, while the sum is 42.

The square root of 842926821 is about 29033.2020452447. The cubic root of 842926821 is about 944.6333865270.

The spelling of 842926821 in words is "eight hundred forty-two million, nine hundred twenty-six thousand, eight hundred twenty-one".