3945389 has 16 divisors (see below), whose sum is σ = 4717440. Its totient is φ = 3229440.

The previous prime is 3945367. The next prime is 3945391. The reversal of 3945389 is 9835493.

It is a cyclic number.

It is not a de Polignac number, because 3945389 - 2¹² = 3941293 is a prime.

It is a super-2 number, since 2×3945389² = 31132188722642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945329) 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 15 ways as a sum of consecutive naturals, for example, 16817 + ... + 17049.

It is an arithmetic number, because the mean of its divisors is an integer number (294840).

Almost surely, 2^3945389 is an apocalyptic number.

It is an amenable number.

3945389 is a deficient number, since it is larger than the sum of its proper divisors (772051).

3945389 is a wasteful number, since it uses less digits than its factorization.

3945389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340.

The product of its digits is 116640, while the sum is 41.

The square root of 3945389 is about 1986.3003297588. The cubic root of 3945389 is about 158.0143793995.

It can be divided in two parts, 3945 and 389, that added together give a palindrome (4334).

The spelling of 3945389 in words is "three million, nine hundred forty-five thousand, three hundred eighty-nine".