5640999 has 16 divisors (see below), whose sum is σ = 9257472. Its totient is φ = 2975328.

The previous prime is 5640989. The next prime is 5641019. The reversal of 5640999 is 9990465.

It is a happy number.

It is not a de Polignac number, because 5640999 - 2⁷ = 5640871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5640999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5640919) 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, 10059 + ... + 10604.

It is an arithmetic number, because the mean of its divisors is an integer number (578592).

Almost surely, 2^5640999 is an apocalyptic number.

5640999 is a deficient number, since it is larger than the sum of its proper divisors (3616473).

5640999 is a wasteful number, since it uses less digits than its factorization.

5640999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20686.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 5640999 is about 2375.0787355370. The cubic root of 5640999 is about 178.0131181680.

It can be divided in two parts, 564099 and 9, that multiplied together give a triangular number (5076891 = T₃₁₈₆).

The spelling of 5640999 in words is "five million, six hundred forty thousand, nine hundred ninety-nine".