3661819 has 6 divisors (see below), whose sum is σ = 4259724. Its totient is φ = 3138660.

The previous prime is 3661781. The next prime is 3661831. The reversal of 3661819 is 9181663.

It is not a de Polignac number, because 3661819 - 2¹⁵ = 3629051 is a prime.

It is a super-2 number, since 2×3661819² = 26817836777522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3661019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37317 + ... + 37414.

It is an arithmetic number, because the mean of its divisors is an integer number (709954).

Almost surely, 2^3661819 is an apocalyptic number.

3661819 is a deficient number, since it is larger than the sum of its proper divisors (597905).

3661819 is an equidigital number, since it uses as much as digits as its factorization.

3661819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74745 (or 74738 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 3661819 is about 1913.5879911831. The cubic root of 3661819 is about 154.1341805748.

The spelling of 3661819 in words is "three million, six hundred sixty-one thousand, eight hundred nineteen".