3721765 has 4 divisors (see below), whose sum is σ = 4466124. Its totient is φ = 2977408.

The previous prime is 3721741. The next prime is 3721771. The reversal of 3721765 is 5671273.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5671273 = 181 ⋅31333.

It can be written as a sum of positive squares in 2 ways, for example, as 986049 + 2735716 = 993^2 + 1654^2 .

It is a cyclic number.

It is not a de Polignac number, because 3721765 - 2¹¹ = 3719717 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 372172 + ... + 372181.

It is an arithmetic number, because the mean of its divisors is an integer number (1116531).

Almost surely, 2^3721765 is an apocalyptic number.

It is an amenable number.

3721765 is a deficient number, since it is larger than the sum of its proper divisors (744359).

3721765 is an equidigital number, since it uses as much as digits as its factorization.

3721765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744358.

The product of its digits is 8820, while the sum is 31.

The square root of 3721765 is about 1929.1876528736. The cubic root of 3721765 is about 154.9707194083.

The spelling of 3721765 in words is "three million, seven hundred twenty-one thousand, seven hundred sixty-five".