6445918 has 8 divisors (see below), whose sum is σ = 9930312. Its totient is φ = 3135816.

The previous prime is 6445871. The next prime is 6445919. The reversal of 6445918 is 8195446.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445919) 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 3 ways as a sum of consecutive naturals, for example, 43480 + ... + 43627.

It is an arithmetic number, because the mean of its divisors is an integer number (1241289).

Almost surely, 2^6445918 is an apocalyptic number.

6445918 is a deficient number, since it is larger than the sum of its proper divisors (3484394).

6445918 is a wasteful number, since it uses less digits than its factorization.

6445918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87146.

The product of its digits is 34560, while the sum is 37.

The square root of 6445918 is about 2538.8812496846. The cubic root of 6445918 is about 186.1065216330.

The spelling of 6445918 in words is "six million, four hundred forty-five thousand, nine hundred eighteen".