13439866 has 16 divisors (see below), whose sum is σ = 22949568. Its totient is φ = 5843200.

The previous prime is 13439831. The next prime is 13439869. The reversal of 13439866 is 66893431.

It is not an unprimeable number, because it can be changed into a prime (13439869) 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 7 ways as a sum of consecutive naturals, for example, 12775 + ... + 13786.

It is an arithmetic number, because the mean of its divisors is an integer number (1434348).

Almost surely, 2^13439866 is an apocalyptic number.

13439866 is a deficient number, since it is larger than the sum of its proper divisors (9509702).

13439866 is a wasteful number, since it uses less digits than its factorization.

13439866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26597.

The product of its digits is 93312, while the sum is 40.

The square root of 13439866 is about 3666.0422801708. The cubic root of 13439866 is about 237.7560879437.

It can be divided in two parts, 134 and 39866, that added together give a square (40000 = 200²).

The spelling of 13439866 in words is "thirteen million, four hundred thirty-nine thousand, eight hundred sixty-six".