3861646 has 4 divisors (see below), whose sum is σ = 5792472. Its totient is φ = 1930822.

The previous prime is 3861607. The next prime is 3861659. The reversal of 3861646 is 6461683.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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, 965410 + ... + 965413.

It is an arithmetic number, because the mean of its divisors is an integer number (1448118).

Almost surely, 2^3861646 is an apocalyptic number.

3861646 is a deficient number, since it is larger than the sum of its proper divisors (1930826).

3861646 is a wasteful number, since it uses less digits than its factorization.

3861646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930825.

The product of its digits is 20736, while the sum is 34.

The square root of 3861646 is about 1965.1071217621. The cubic root of 3861646 is about 156.8883948605. Note that the first 3 decimals are identical.

The spelling of 3861646 in words is "three million, eight hundred sixty-one thousand, six hundred forty-six".