13644813 has 32 divisors (see below), whose sum is σ = 22607872. Its totient is φ = 7128000.

The previous prime is 13644809. The next prime is 13644817. The reversal of 13644813 is 31844631.

It is an interprime number because it is at equal distance from previous prime (13644809) and next prime (13644817).

It is not a de Polignac number, because 13644813 - 2² = 13644809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13644817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41058 + ... + 41388.

It is an arithmetic number, because the mean of its divisors is an integer number (706496).

Almost surely, 2^13644813 is an apocalyptic number.

13644813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

13644813 is a deficient number, since it is larger than the sum of its proper divisors (8963059).

13644813 is a wasteful number, since it uses less digits than its factorization.

13644813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505.

The product of its digits is 6912, while the sum is 30.

The square root of 13644813 is about 3693.8886014605. Note that the first 3 decimals coincide. The cubic root of 13644813 is about 238.9585252751.

The spelling of 13644813 in words is "thirteen million, six hundred forty-four thousand, eight hundred thirteen".