3609999 has 12 divisors (see below), whose sum is σ = 5241912. Its totient is φ = 2394000.

The previous prime is 3609997. The next prime is 3610003. The reversal of 3609999 is 9999063.

It is a Cunningham number, because it is equal to 1900²-1.

It is not a de Polignac number, because 3609999 - 2¹ = 3609997 is a prime.

3609999 is a modest number, since divided by 9999 gives 360 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3609997) 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 11 ways as a sum of consecutive naturals, for example, 949 + ... + 2849.

It is an arithmetic number, because the mean of its divisors is an integer number (436826).

Almost surely, 2^3609999 is an apocalyptic number.

3609999 is a deficient number, since it is larger than the sum of its proper divisors (1631913).

3609999 is a wasteful number, since it uses less digits than its factorization.

3609999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 3609999 is about 1899.9997368421. Note that the first 3 decimals coincide. The cubic root of 3609999 is about 153.4036502732.

It can be divided in two parts, 36099 and 99, that multiplied together give a triangular number (3573801 = T₂₆₇₃).

The spelling of 3609999 in words is "three million, six hundred nine thousand, nine hundred ninety-nine".