13940805 has 16 divisors (see below), whose sum is σ = 22377600. Its totient is φ = 7411008.

The previous prime is 13940803. The next prime is 13940809. The reversal of 13940805 is 50804931.

It is not a de Polignac number, because 13940805 - 2¹ = 13940803 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13940803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3904 + ... + 6566.

It is an arithmetic number, because the mean of its divisors is an integer number (1398600).

Almost surely, 2^13940805 is an apocalyptic number.

13940805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13940805 is a deficient number, since it is larger than the sum of its proper divisors (8436795).

13940805 is a wasteful number, since it uses less digits than its factorization.

13940805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 13940805 is about 3733.7387428689. The cubic root of 13940805 is about 240.6740599354.

The spelling of 13940805 in words is "thirteen million, nine hundred forty thousand, eight hundred five".