3520665 has 20 divisors (see below), whose sum is σ = 6311844. Its totient is φ = 1877472.

The previous prime is 3520663. The next prime is 3520667. The reversal of 3520665 is 5660253.

It is an interprime number because it is at equal distance from previous prime (3520663) and next prime (3520667).

It can be written as a sum of positive squares in 2 ways, for example, as 627264 + 2893401 = 792^2 + 1701^2 .

It is not a de Polignac number, because 3520665 - 2¹ = 3520663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (3520663) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3942 + ... + 4751.

Almost surely, 2^3520665 is an apocalyptic number.

It is an amenable number.

3520665 is a deficient number, since it is larger than the sum of its proper divisors (2791179).

3520665 is an equidigital number, since it uses as much as digits as its factorization.

3520665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8710 (or 8701 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 3520665 is about 1876.3435186554. The cubic root of 3520665 is about 152.1276772340.

The spelling of 3520665 in words is "three million, five hundred twenty thousand, six hundred sixty-five".