3621891 has 16 divisors (see below), whose sum is σ = 5944064. Its totient is φ = 1910304.

The previous prime is 3621889. The next prime is 3621907. The reversal of 3621891 is 1981263.

It is not a de Polignac number, because 3621891 - 2¹ = 3621889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3621851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6361 + ... + 6906.

It is an arithmetic number, because the mean of its divisors is an integer number (371504).

Almost surely, 2^3621891 is an apocalyptic number.

3621891 is a deficient number, since it is larger than the sum of its proper divisors (2322173).

3621891 is a wasteful number, since it uses less digits than its factorization.

3621891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13290.

The product of its digits is 2592, while the sum is 30.

The square root of 3621891 is about 1903.1266379303. The cubic root of 3621891 is about 153.5719122496.

The spelling of 3621891 in words is "three million, six hundred twenty-one thousand, eight hundred ninety-one".