3906646 has 4 divisors (see below), whose sum is σ = 5859972. Its totient is φ = 1953322.

The previous prime is 3906641. The next prime is 3906653. The reversal of 3906646 is 6466093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6466093 = 457 ⋅14149.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3906641) 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 as a sum of consecutive naturals, namely, 976660 + ... + 976663.

It is an arithmetic number, because the mean of its divisors is an integer number (1464993).

Almost surely, 2^3906646 is an apocalyptic number.

3906646 is a deficient number, since it is larger than the sum of its proper divisors (1953326).

3906646 is a wasteful number, since it uses less digits than its factorization.

3906646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953325.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 3906646 is about 1976.5237160227. The cubic root of 3906646 is about 157.4954529635.

The spelling of 3906646 in words is "three million, nine hundred six thousand, six hundred forty-six".