3820820 has 24 divisors (see below), whose sum is σ = 8136744. Its totient is φ = 1506816.

The previous prime is 3820813. The next prime is 3820841. The reversal of 3820820 is 280283.

It can be written as a sum of positive squares in 4 ways, for example, as 1473796 + 2347024 = 1214^2 + 1532^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152 + ... + 2768.

It is an arithmetic number, because the mean of its divisors is an integer number (339031).

Almost surely, 2^3820820 is an apocalyptic number.

It is an amenable number.

3820820 is an abundant number, since it is smaller than the sum of its proper divisors (4315924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3820820 is a wasteful number, since it uses less digits than its factorization.

3820820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2699 (or 2697 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 3820820 is about 1954.6917915620. The cubic root of 3820820 is about 156.3335510484. Note that the first 3 decimals are identical.

The spelling of 3820820 in words is "three million, eight hundred twenty thousand, eight hundred twenty".