3821209 has 16 divisors (see below), whose sum is σ = 4675968. Its totient is φ = 3048192.

The previous prime is 3821203. The next prime is 3821219. The reversal of 3821209 is 9021283.

It is not a de Polignac number, because 3821209 - 2⁵ = 3821177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3821203) 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, 19299 + ... + 19495.

It is an arithmetic number, because the mean of its divisors is an integer number (292248).

Almost surely, 2^3821209 is an apocalyptic number.

It is an amenable number.

3821209 is a deficient number, since it is larger than the sum of its proper divisors (854759).

3821209 is a wasteful number, since it uses less digits than its factorization.

3821209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 3821209 is about 1954.7912932075. The cubic root of 3821209 is about 156.3388563395.

The spelling of 3821209 in words is "three million, eight hundred twenty-one thousand, two hundred nine".