3945399 has 8 divisors (see below), whose sum is σ = 5334912. Its totient is φ = 2593080.

The previous prime is 3945391. The next prime is 3945413. The reversal of 3945399 is 9935493.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3945399 - 2³ = 3945391 is a prime.

3945399 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3945399.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9049 + ... + 9474.

It is an arithmetic number, because the mean of its divisors is an integer number (666864).

Almost surely, 2^3945399 is an apocalyptic number.

3945399 is a deficient number, since it is larger than the sum of its proper divisors (1389513).

3945399 is a wasteful number, since it uses less digits than its factorization.

3945399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18597.

The product of its digits is 131220, while the sum is 42.

The square root of 3945399 is about 1986.3028469999. The cubic root of 3945399 is about 158.0145129007.

The spelling of 3945399 in words is "three million, nine hundred forty-five thousand, three hundred ninety-nine".