13621655 has 8 divisors (see below), whose sum is σ = 16366272. Its totient is φ = 10883808.

The previous prime is 13621649. The next prime is 13621667. The reversal of 13621655 is 55612631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13621655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5609 + ... + 7661.

It is an arithmetic number, because the mean of its divisors is an integer number (2045784).

Almost surely, 2^13621655 is an apocalyptic number.

13621655 is a deficient number, since it is larger than the sum of its proper divisors (2744617).

13621655 is a wasteful number, since it uses less digits than its factorization.

13621655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3385.

The product of its digits is 5400, while the sum is 29.

The square root of 13621655 is about 3690.7526332714. The cubic root of 13621655 is about 238.8232617836.

The spelling of 13621655 in words is "thirteen million, six hundred twenty-one thousand, six hundred fifty-five".