3946389 has 4 divisors (see below), whose sum is σ = 5261856. Its totient is φ = 2630924.

The previous prime is 3946387. The next prime is 3946391. The reversal of 3946389 is 9836493.

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: 9836493 = 3 ⋅3278831.

It is an interprime number because it is at equal distance from previous prime (3946387) and next prime (3946391).

It is a cyclic number.

It is not a de Polignac number, because 3946389 - 2¹ = 3946387 is a prime.

It is a super-2 number, since 2×3946389² = 31147972278642, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 3946389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3946381) 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, 657729 + ... + 657734.

It is an arithmetic number, because the mean of its divisors is an integer number (1315464).

Almost surely, 2^3946389 is an apocalyptic number.

It is an amenable number.

3946389 is a deficient number, since it is larger than the sum of its proper divisors (1315467).

3946389 is a wasteful number, since it uses less digits than its factorization.

3946389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315466.

The product of its digits is 139968, while the sum is 42.

The square root of 3946389 is about 1986.5520380800. The cubic root of 3946389 is about 158.0277284027.

The spelling of 3946389 in words is "three million, nine hundred forty-six thousand, three hundred eighty-nine".