6421145 has 16 divisors (see below), whose sum is σ = 8173440. Its totient is φ = 4829184.

The previous prime is 6421141. The next prime is 6421157. The reversal of 6421145 is 5411246.

It is a cyclic number.

It is not a de Polignac number, because 6421145 - 2² = 6421141 is a prime.

It is a super-2 number, since 2×6421145² = 82462206222050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6421145.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24284 + ... + 24546.

It is an arithmetic number, because the mean of its divisors is an integer number (510840).

Almost surely, 2^6421145 is an apocalyptic number.

It is an amenable number.

6421145 is a deficient number, since it is larger than the sum of its proper divisors (1752295).

6421145 is a wasteful number, since it uses less digits than its factorization.

6421145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544.

The product of its digits is 960, while the sum is 23.

The square root of 6421145 is about 2533.9978295176. The cubic root of 6421145 is about 185.8678002300.

The spelling of 6421145 in words is "six million, four hundred twenty-one thousand, one hundred forty-five".