6445845 has 64 divisors (see below), whose sum is σ = 13824000. Its totient is φ = 2783808.

The previous prime is 6445841. The next prime is 6445849. The reversal of 6445845 is 5485446.

6445845 is a `hidden beast` number, since 644 + 5 + 8 + 4 + 5 = 666.

6445845 is a nontrivial binomial coefficient, being equal to C(3591, 2).

It is an interprime number because it is at equal distance from previous prime (6445841) and next prime (6445849).

It is not a de Polignac number, because 6445845 - 2² = 6445841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17776 + ... + 18134.

It is an arithmetic number, because the mean of its divisors is an integer number (216000).

Almost surely, 2^6445845 is an apocalyptic number.

6445845 is the 3590-th triangular number.

It is an amenable number.

6445845 is an abundant number, since it is smaller than the sum of its proper divisors (7378155).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6445845 is a wasteful number, since it uses less digits than its factorization.

6445845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 393 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

The square root of 6445845 is about 2538.8668732330. The cubic root of 6445845 is about 186.1058190784.

The spelling of 6445845 in words is "six million, four hundred forty-five thousand, eight hundred forty-five".