3945569 has 4 divisors (see below), whose sum is σ = 4052244. Its totient is φ = 3838896.

The previous prime is 3945527. The next prime is 3945607. The reversal of 3945569 is 9655493.

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 3751969 + 193600 = 1937^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 3945569 - 2⁸ = 3945313 is a prime.

It is a super-2 number, since 2×3945569² = 31135029467522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3942569) 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, 53282 + ... + 53355.

It is an arithmetic number, because the mean of its divisors is an integer number (1013061).

Almost surely, 2^3945569 is an apocalyptic number.

It is an amenable number.

3945569 is a deficient number, since it is larger than the sum of its proper divisors (106675).

3945569 is a wasteful number, since it uses less digits than its factorization.

3945569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106674.

The product of its digits is 145800, while the sum is 41.

The square root of 3945569 is about 1986.3456396106. The cubic root of 3945569 is about 158.0167823866.

The spelling of 3945569 in words is "three million, nine hundred forty-five thousand, five hundred sixty-nine".