6399545 has 16 divisors (see below), whose sum is σ = 7912080. Its totient is φ = 4967424.

The previous prime is 6399541. The next prime is 6399551. The reversal of 6399545 is 5459936.

It can be written as a sum of positive squares in 8 ways, for example, as 89401 + 6310144 = 299^2 + 2512^2 .

It is a cyclic number.

It is not a de Polignac number, because 6399545 - 2² = 6399541 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6399541) 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 15 ways as a sum of consecutive naturals, for example, 32387 + ... + 32583.

It is an arithmetic number, because the mean of its divisors is an integer number (494505).

Almost surely, 2^6399545 is an apocalyptic number.

It is an amenable number.

6399545 is a deficient number, since it is larger than the sum of its proper divisors (1512535).

6399545 is a wasteful number, since it uses less digits than its factorization.

6399545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364.

The product of its digits is 145800, while the sum is 41.

The square root of 6399545 is about 2529.7321992654. The cubic root of 6399545 is about 185.6591534008.

The spelling of 6399545 in words is "six million, three hundred ninety-nine thousand, five hundred forty-five".