3780665 has 16 divisors (see below), whose sum is σ = 5237760. Its totient is φ = 2566080.

The previous prime is 3780653. The next prime is 3780709. The reversal of 3780665 is 5660873.

It is a happy number.

3780665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3780665 - 2¹² = 3776569 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an Ulam number.

It is a d-powerful number, because it can be written as 3⁶ + 7 + 8⁷ + 0 + 6² + 6⁸ + 5⁵ .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3320 + ... + 4310.

It is an arithmetic number, because the mean of its divisors is an integer number (327360).

Almost surely, 2^3780665 is an apocalyptic number.

3780665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3780665 is a deficient number, since it is larger than the sum of its proper divisors (1457095).

3780665 is a wasteful number, since it uses less digits than its factorization.

3780665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 3780665 is about 1944.3932215475. The cubic root of 3780665 is about 155.7839574632.

The spelling of 3780665 in words is "three million, seven hundred eighty thousand, six hundred sixty-five".