3689405 has 6 divisors (see below), whose sum is σ = 4432446. Its totient is φ = 2948088.

The previous prime is 3689377. The next prime is 3689417. The reversal of 3689405 is 5049863.

It can be written as a sum of positive squares in only one way, i.e., 2951524 + 737881 = 1718^2 + 859^2 .

It is not a de Polignac number, because 3689405 - 2⁸ = 3689149 is a prime.

It is a super-2 number, since 2×3689405² = 27223418508050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 3866 + ... + 4724.

It is an arithmetic number, because the mean of its divisors is an integer number (738741).

Almost surely, 2^3689405 is an apocalyptic number.

It is an amenable number.

3689405 is a deficient number, since it is larger than the sum of its proper divisors (743041).

3689405 is an frugal number, since it uses more digits than its factorization.

3689405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723 (or 864 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 3689405 is about 1920.7823926723. The cubic root of 3689405 is about 154.5202648994.

Multiplying 3689405 by its product of nonzero digits (25920), we get a square (95629377600 = 309240²).

The spelling of 3689405 in words is "three million, six hundred eighty-nine thousand, four hundred five".