8408421 has 32 divisors (see below), whose sum is σ = 15079680. Its totient is φ = 4520448.

The previous prime is 8408401. The next prime is 8408429. The reversal of 8408421 is 1248048.

It is not a de Polignac number, because 8408421 - 2⁶ = 8408357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8408429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1905 + ... + 4521.

It is an arithmetic number, because the mean of its divisors is an integer number (471240).

Almost surely, 2^8408421 is an apocalyptic number.

It is an amenable number.

8408421 is a deficient number, since it is larger than the sum of its proper divisors (6671259).

8408421 is a wasteful number, since it uses less digits than its factorization.

8408421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650 (or 2644 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 8408421 is about 2899.7277458410. The cubic root of 8408421 is about 203.3471778325.

It can be divided in two parts, 840 and 8421, that added together give a cube (9261 = 21³).

The spelling of 8408421 in words is "eight million, four hundred eight thousand, four hundred twenty-one".