13309906 has 4 divisors (see below), whose sum is σ = 19964862. Its totient is φ = 6654952.

The previous prime is 13309897. The next prime is 13309913. The reversal of 13309906 is 60990331.

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., 9979281 + 3330625 = 3159^2 + 1825^2 .

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, 3327475 + ... + 3327478.

Almost surely, 2^13309906 is an apocalyptic number.

13309906 is a deficient number, since it is larger than the sum of its proper divisors (6654956).

13309906 is an equidigital number, since it uses as much as digits as its factorization.

13309906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6654955.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 13309906 is about 3648.2743866107. The cubic root of 13309906 is about 236.9872580045.

It can be divided in two parts, 1330 and 9906, that added together give a square (11236 = 106²).

The spelling of 13309906 in words is "thirteen million, three hundred nine thousand, nine hundred six".