5999665 has 32 divisors (see below), whose sum is σ = 8916480. Its totient is φ = 3784704.

The previous prime is 5999663. The next prime is 5999677. The reversal of 5999665 is 5669995.

It is a happy number.

It is not a de Polignac number, because 5999665 - 2¹ = 5999663 is a prime.

It is a super-2 number, since 2×5999665² = 71991960224450, which contains 22 as substring.

It is an Ulam number.

5999665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5999663) 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 31 ways as a sum of consecutive naturals, for example, 23217 + ... + 23473.

It is an arithmetic number, because the mean of its divisors is an integer number (278640).

Almost surely, 2^5999665 is an apocalyptic number.

It is an amenable number.

5999665 is a deficient number, since it is larger than the sum of its proper divisors (2916815).

5999665 is a wasteful number, since it uses less digits than its factorization.

5999665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321.

The product of its digits is 656100, while the sum is 49.

The square root of 5999665 is about 2449.4213602400. The cubic root of 5999665 is about 181.7086773569.

The spelling of 5999665 in words is "five million, nine hundred ninety-nine thousand, six hundred sixty-five".