3777661 has 4 divisors (see below), whose sum is σ = 3834112. Its totient is φ = 3721212.

The previous prime is 3777623. The next prime is 3777667. The reversal of 3777661 is 1667773.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3777661 - 2²¹ = 1680509 is a prime.

It is a Duffinian number.

3777661 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3777661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3777667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28125 + ... + 28258.

It is an arithmetic number, because the mean of its divisors is an integer number (958528).

Almost surely, 2^3777661 is an apocalyptic number.

It is an amenable number.

3777661 is a deficient number, since it is larger than the sum of its proper divisors (56451).

3777661 is an equidigital number, since it uses as much as digits as its factorization.

3777661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56450.

The product of its digits is 37044, while the sum is 37.

The square root of 3777661 is about 1943.6205905474. The cubic root of 3777661 is about 155.7426861517.

The spelling of 3777661 in words is "three million, seven hundred seventy-seven thousand, six hundred sixty-one".