3945445 has 32 divisors (see below), whose sum is σ = 6048000. Its totient is φ = 2405376.

The previous prime is 3945427. The next prime is 3945449. The reversal of 3945445 is 5445493.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3945445 - 2⁵ = 3945413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3945445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11131 + ... + 11479.

It is an arithmetic number, because the mean of its divisors is an integer number (189000).

Almost surely, 2^3945445 is an apocalyptic number.

3945445 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3945445 is a deficient number, since it is larger than the sum of its proper divisors (2102555).

3945445 is a wasteful number, since it uses less digits than its factorization.

3945445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397.

The product of its digits is 43200, while the sum is 34.

The square root of 3945445 is about 1986.3144262679. The cubic root of 3945445 is about 158.0151270033.

The spelling of 3945445 in words is "three million, nine hundred forty-five thousand, four hundred forty-five".