13605986 has 4 divisors (see below), whose sum is σ = 20408982. Its totient is φ = 6802992.

The previous prime is 13605961. The next prime is 13606003. The reversal of 13605986 is 68950631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12996025 + 609961 = 3605^2 + 781^2 .

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3401495 + ... + 3401498.

Almost surely, 2^13605986 is an apocalyptic number.

13605986 is a deficient number, since it is larger than the sum of its proper divisors (6802996).

13605986 is an equidigital number, since it uses as much as digits as its factorization.

13605986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6802995.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 13605986 is about 3688.6292847073. The cubic root of 13605986 is about 238.7316537898.

The spelling of 13605986 in words is "thirteen million, six hundred five thousand, nine hundred eighty-six".