3945397 has 4 divisors (see below), whose sum is σ = 4116960. Its totient is φ = 3773836.

The previous prime is 3945391. The next prime is 3945413. The reversal of 3945397 is 7935493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7935493 = 1597 ⋅4969.

It is a cyclic number.

It is not a de Polignac number, because 3945397 - 2¹⁹ = 3421109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945391) 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 3 ways as a sum of consecutive naturals, for example, 85747 + ... + 85792.

It is an arithmetic number, because the mean of its divisors is an integer number (1029240).

Almost surely, 2^3945397 is an apocalyptic number.

It is an amenable number.

3945397 is a deficient number, since it is larger than the sum of its proper divisors (171563).

3945397 is a wasteful number, since it uses less digits than its factorization.

3945397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171562.

The product of its digits is 102060, while the sum is 40.

The square root of 3945397 is about 1986.3023435520. The cubic root of 3945397 is about 158.0144862005.

The spelling of 3945397 in words is "three million, nine hundred forty-five thousand, three hundred ninety-seven".