3691405 has 8 divisors (see below), whose sum is σ = 4440312. Its totient is φ = 2946048.

The previous prime is 3691403. The next prime is 3691447. The reversal of 3691405 is 5041963.

3691405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 54756 + 3636649 = 234^2 + 1907^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3691405 - 2¹ = 3691403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3691403) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2817 + ... + 3913.

It is an arithmetic number, because the mean of its divisors is an integer number (555039).

Almost surely, 2^3691405 is an apocalyptic number.

It is an amenable number.

3691405 is a deficient number, since it is larger than the sum of its proper divisors (748907).

3691405 is a wasteful number, since it uses less digits than its factorization.

3691405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 3691405 is about 1921.3029433174. The cubic root of 3691405 is about 154.5481812982.

It can be divided in two parts, 3691 and 405, that added together give a 12-th power (4096 = 2¹²).

The spelling of 3691405 in words is "three million, six hundred ninety-one thousand, four hundred five".