3661779 has 16 divisors (see below), whose sum is σ = 5472000. Its totient is φ = 2158560.

The previous prime is 3661771. The next prime is 3661781. The reversal of 3661779 is 9771663.

It is not a de Polignac number, because 3661779 - 2³ = 3661771 is a prime.

3661779 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3661771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279 + ... + 2720.

It is an arithmetic number, because the mean of its divisors is an integer number (342000).

Almost surely, 2^3661779 is an apocalyptic number.

3661779 is a deficient number, since it is larger than the sum of its proper divisors (1810221).

3661779 is a wasteful number, since it uses less digits than its factorization.

3661779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3050.

The product of its digits is 47628, while the sum is 39.

The square root of 3661779 is about 1913.5775395839. The cubic root of 3661779 is about 154.1336193429.

It can be divided in two parts, 366 and 1779, that added together give a triangular number (2145 = T₆₅).

The spelling of 3661779 in words is "three million, six hundred sixty-one thousand, seven hundred seventy-nine".