3621655 has 4 divisors (see below), whose sum is σ = 4345992. Its totient is φ = 2897320.

The previous prime is 3621643. The next prime is 3621661. The reversal of 3621655 is 5561263.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3621655 - 2⁵ = 3621623 is a prime.

It is an Ulam number.

It is a Duffinian number.

3621655 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362161 + ... + 362170.

It is an arithmetic number, because the mean of its divisors is an integer number (1086498).

Almost surely, 2^3621655 is an apocalyptic number.

3621655 is a deficient number, since it is larger than the sum of its proper divisors (724337).

3621655 is an equidigital number, since it uses as much as digits as its factorization.

3621655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724336.

The product of its digits is 5400, while the sum is 28.

The square root of 3621655 is about 1903.0646336896. The cubic root of 3621655 is about 153.5685766294.

The spelling of 3621655 in words is "three million, six hundred twenty-one thousand, six hundred fifty-five".