13785999 has 16 divisors (see below), whose sum is σ = 18973440. Its totient is φ = 8899520.

The previous prime is 13785983. The next prime is 13786007. The reversal of 13785999 is 99958731.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13785999 - 2⁴ = 13785983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13785949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12019 + ... + 13115.

It is an arithmetic number, because the mean of its divisors is an integer number (1185840).

Almost surely, 2^13785999 is an apocalyptic number.

13785999 is a deficient number, since it is larger than the sum of its proper divisors (5187441).

13785999 is a wasteful number, since it uses less digits than its factorization.

13785999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230.

The product of its digits is 612360, while the sum is 51.

The square root of 13785999 is about 3712.9501747263. The cubic root of 13785999 is about 239.7798849897.

The spelling of 13785999 in words is "thirteen million, seven hundred eighty-five thousand, nine hundred ninety-nine".