3621905 has 8 divisors (see below), whose sum is σ = 4967232. Its totient is φ = 2483568.

The previous prime is 3621889. The next prime is 3621907. The reversal of 3621905 is 5091263.

3621905 = 12² + 13² + ... + 221².

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

It is a cyclic number.

It is not a de Polignac number, because 3621905 - 2⁴ = 3621889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3621907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51707 + ... + 51776.

It is an arithmetic number, because the mean of its divisors is an integer number (620904).

Almost surely, 2^3621905 is an apocalyptic number.

3621905 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3621905 is a deficient number, since it is larger than the sum of its proper divisors (1345327).

3621905 is a wasteful number, since it uses less digits than its factorization.

3621905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103495.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 3621905 is about 1903.1303160845. The cubic root of 3621905 is about 153.5721101209.

The spelling of 3621905 in words is "three million, six hundred twenty-one thousand, nine hundred five".