8340921 has 8 divisors (see below), whose sum is σ = 12356960. Its totient is φ = 5560596.

The previous prime is 8340911. The next prime is 8340961. The reversal of 8340921 is 1290438.

It is not a de Polignac number, because 8340921 - 2⁷ = 8340793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 308923 = 8340921 / (8 + 3 + 4 + 0 + 9 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

8340921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8340911) 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, 154435 + ... + 154488.

It is an arithmetic number, because the mean of its divisors is an integer number (1544620).

Almost surely, 2^8340921 is an apocalyptic number.

It is an amenable number.

8340921 is a deficient number, since it is larger than the sum of its proper divisors (4016039).

8340921 is a wasteful number, since it uses less digits than its factorization.

8340921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308932 (or 308926 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 8340921 is about 2888.0652693456. The cubic root of 8340921 is about 202.8015808147.

It can be divided in two parts, 8340 and 921, that added together give a cube (9261 = 21³).

The spelling of 8340921 in words is "eight million, three hundred forty thousand, nine hundred twenty-one".