3820815 has 24 divisors (see below), whose sum is σ = 6671808. Its totient is φ = 2022720.

The previous prime is 3820813. The next prime is 3820841. The reversal of 3820815 is 5180283.

It is a happy number.

It is not a de Polignac number, because 3820815 - 2¹ = 3820813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3820811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8650 + ... + 9080.

It is an arithmetic number, because the mean of its divisors is an integer number (277992).

Almost surely, 2^3820815 is an apocalyptic number.

3820815 is a deficient number, since it is larger than the sum of its proper divisors (2850993).

3820815 is a wasteful number, since it uses less digits than its factorization.

3820815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 3820815 is about 1954.6905125876. The cubic root of 3820815 is about 156.3334828546. Note that the first 3 decimals are identical.

The spelling of 3820815 in words is "three million, eight hundred twenty thousand, eight hundred fifteen".