8426921 has 4 divisors (see below), whose sum is σ = 8464272. Its totient is φ = 8389572.

The previous prime is 8426903. The next prime is 8426939. The reversal of 8426921 is 1296248.

8426921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (8426903) and next prime (8426939).

It is a cyclic number.

It is not a de Polignac number, because 8426921 - 2¹⁴ = 8410537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8426021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18335 + ... + 18788.

It is an arithmetic number, because the mean of its divisors is an integer number (2116068).

Almost surely, 2^8426921 is an apocalyptic number.

It is an amenable number.

8426921 is a deficient number, since it is larger than the sum of its proper divisors (37351).

8426921 is a wasteful number, since it uses less digits than its factorization.

8426921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37350.

The product of its digits is 6912, while the sum is 32.

The square root of 8426921 is about 2902.9159478015. The cubic root of 8426921 is about 203.4962017373.

The spelling of 8426921 in words is "eight million, four hundred twenty-six thousand, nine hundred twenty-one".