3721565 has 4 divisors (see below), whose sum is σ = 4465884. Its totient is φ = 2977248.

The previous prime is 3721559. The next prime is 3721583. The reversal of 3721565 is 5651273.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 851929 + 2869636 = 923^2 + 1694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3721565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372152 + ... + 372161.

It is an arithmetic number, because the mean of its divisors is an integer number (1116471).

Almost surely, 2^3721565 is an apocalyptic number.

It is an amenable number.

3721565 is a deficient number, since it is larger than the sum of its proper divisors (744319).

3721565 is an equidigital number, since it uses as much as digits as its factorization.

3721565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744318.

The product of its digits is 6300, while the sum is 29.

The square root of 3721565 is about 1929.1358168880. The cubic root of 3721565 is about 154.9679434227.

The spelling of 3721565 in words is "three million, seven hundred twenty-one thousand, five hundred sixty-five".