3930406 has 4 divisors (see below), whose sum is σ = 5895612. Its totient is φ = 1965202.

The previous prime is 3930391. The next prime is 3930439. The reversal of 3930406 is 6040393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6040393 = 47 ⋅128519.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982600 + ... + 982603.

It is an arithmetic number, because the mean of its divisors is an integer number (1473903).

Almost surely, 2^3930406 is an apocalyptic number.

3930406 is a deficient number, since it is larger than the sum of its proper divisors (1965206).

3930406 is a wasteful number, since it uses less digits than its factorization.

3930406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1965205.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 3930406 is about 1982.5251574696. The cubic root of 3930406 is about 157.8141006471.

Adding to 3930406 its reverse (6040393), we get a palindrome (9970799).

The spelling of 3930406 in words is "three million, nine hundred thirty thousand, four hundred six".