3966505 has 4 divisors (see below), whose sum is σ = 4759812. Its totient is φ = 3173200.

The previous prime is 3966503. The next prime is 3966517. The reversal of 3966505 is 5056693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5056693 = 1637 ⋅3089.

It can be written as a sum of positive squares in 2 ways, for example, as 473344 + 3493161 = 688^2 + 1869^2 .

It is not a de Polignac number, because 3966505 - 2¹ = 3966503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3966503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396646 + ... + 396655.

It is an arithmetic number, because the mean of its divisors is an integer number (1189953).

Almost surely, 2^3966505 is an apocalyptic number.

It is an amenable number.

3966505 is a deficient number, since it is larger than the sum of its proper divisors (793307).

3966505 is an equidigital number, since it uses as much as digits as its factorization.

3966505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793306.

The product of its (nonzero) digits is 24300, while the sum is 34.

The square root of 3966505 is about 1991.6086462958. The cubic root of 3966505 is about 158.2957793361.

The spelling of 3966505 in words is "three million, nine hundred sixty-six thousand, five hundred five".