3820215 has 16 divisors (see below), whose sum is σ = 6985728. Its totient is φ = 1746336.

The previous prime is 3820181. The next prime is 3820237. The reversal of 3820215 is 5120283.

It is not a de Polignac number, because 3820215 - 2¹³ = 3812023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 3820191 and 3820200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18087 + ... + 18296.

It is an arithmetic number, because the mean of its divisors is an integer number (436608).

Almost surely, 2^3820215 is an apocalyptic number.

3820215 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3820215 is a deficient number, since it is larger than the sum of its proper divisors (3165513).

3820215 is a wasteful number, since it uses less digits than its factorization.

3820215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36398.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 3820215 is about 1954.5370295802. The cubic root of 3820215 is about 156.3252991731.

Adding to 3820215 its reverse (5120283), we get a palindrome (8940498).

The spelling of 3820215 in words is "three million, eight hundred twenty thousand, two hundred fifteen".