3820261 has 4 divisors (see below), whose sum is σ = 3824172. Its totient is φ = 3816352.

The previous prime is 3820259. The next prime is 3820279. The reversal of 3820261 is 1620283.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1512900 + 2307361 = 1230^2 + 1519^2 .

It is a cyclic number.

It is not a de Polignac number, because 3820261 - 2¹ = 3820259 is a prime.

It is a Duffinian number.

3820261 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3890261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915 + ... + 2911.

It is an arithmetic number, because the mean of its divisors is an integer number (956043).

Almost surely, 2^3820261 is an apocalyptic number.

It is an amenable number.

3820261 is a deficient number, since it is larger than the sum of its proper divisors (3911).

3820261 is a wasteful number, since it uses less digits than its factorization.

3820261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3910.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 3820261 is about 1954.5487970373. The cubic root of 3820261 is about 156.3259266190.

Adding to 3820261 its sum of digits (22), we get a palindrome (3820283).

The spelling of 3820261 in words is "three million, eight hundred twenty thousand, two hundred sixty-one".