3966145 has 4 divisors (see below), whose sum is σ = 4759380. Its totient is φ = 3172912.

The previous prime is 3966139. The next prime is 3966161. The reversal of 3966145 is 5416693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5416693 = 17 ⋅318629.

It can be written as a sum of positive squares in 2 ways, for example, as 1787569 + 2178576 = 1337^2 + 1476^2 .

It is a cyclic number.

It is not a de Polignac number, because 3966145 - 2⁵ = 3966113 is a prime.

It is a super-2 number, since 2×3966145² = 31460612322050, which contains 22 as substring.

3966145 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3966145.

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, 396610 + ... + 396619.

It is an arithmetic number, because the mean of its divisors is an integer number (1189845).

Almost surely, 2^3966145 is an apocalyptic number.

It is an amenable number.

3966145 is a deficient number, since it is larger than the sum of its proper divisors (793235).

3966145 is an equidigital number, since it uses as much as digits as its factorization.

3966145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793234.

The product of its digits is 19440, while the sum is 34.

The square root of 3966145 is about 1991.5182650430. The cubic root of 3966145 is about 158.2909902161.

The spelling of 3966145 in words is "three million, nine hundred sixty-six thousand, one hundred forty-five".