3906389 has 4 divisors (see below), whose sum is σ = 4076256. Its totient is φ = 3736524.

The previous prime is 3906373. The next prime is 3906401. The reversal of 3906389 is 9836093.

It is a happy number.

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: 9836093 = 73 ⋅134741.

It is a cyclic number.

It is not a de Polignac number, because 3906389 - 2⁴ = 3906373 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 (3906319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84899 + ... + 84944.

It is an arithmetic number, because the mean of its divisors is an integer number (1019064).

Almost surely, 2^3906389 is an apocalyptic number.

It is an amenable number.

3906389 is a deficient number, since it is larger than the sum of its proper divisors (169867).

3906389 is a wasteful number, since it uses less digits than its factorization.

3906389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169866.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 3906389 is about 1976.4587018200. The cubic root of 3906389 is about 157.4919992576.

The spelling of 3906389 in words is "three million, nine hundred six thousand, three hundred eighty-nine".