13609999 has 8 divisors (see below), whose sum is σ = 14747040. Its totient is φ = 12485856.

The previous prime is 13609963. The next prime is 13610021. The reversal of 13609999 is 99990631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13609999 - 2⁹ = 13609487 is a prime.

It is a Duffinian number.

13609999 is a modest number, since divided by 9999 gives 1360 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13600999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 964 + ... + 5305.

It is an arithmetic number, because the mean of its divisors is an integer number (1843380).

Almost surely, 2^13609999 is an apocalyptic number.

13609999 is a deficient number, since it is larger than the sum of its proper divisors (1137041).

13609999 is a wasteful number, since it uses less digits than its factorization.

13609999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6449.

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 13609999 is about 3689.1732136076. The cubic root of 13609999 is about 238.7551222826.

It can be divided in two parts, 1 and 3609999, that added together give a square (3610000 = 1900²).

The spelling of 13609999 in words is "thirteen million, six hundred nine thousand, nine hundred ninety-nine".