3646999 has 4 divisors (see below), whose sum is σ = 3653064. Its totient is φ = 3640936.

The previous prime is 3646997. The next prime is 3647003. The reversal of 3646999 is 9996463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9996463 = 139 ⋅71917.

It is a cyclic number.

It is not a de Polignac number, because 3646999 - 2¹ = 3646997 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3646997) 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, 2017 + ... + 3370.

It is an arithmetic number, because the mean of its divisors is an integer number (913266).

Almost surely, 2^3646999 is an apocalyptic number.

3646999 is a deficient number, since it is larger than the sum of its proper divisors (6065).

3646999 is an equidigital number, since it uses as much as digits as its factorization.

3646999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6064.

The product of its digits is 314928, while the sum is 46.

The square root of 3646999 is about 1909.7117583552. The cubic root of 3646999 is about 153.9259637378.

Subtracting from 3646999 its product of digits (314928), we obtain a triangular number (3332071 = T₂₅₈₁).

The spelling of 3646999 in words is "three million, six hundred forty-six thousand, nine hundred ninety-nine".