3870644 has 12 divisors (see below), whose sum is σ = 6956964. Its totient is φ = 1882944.

The previous prime is 3870631. The next prime is 3870649. The reversal of 3870644 is 4460783.

It is a happy number.

3870644 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in 2 ways, for example, as 1993744 + 1876900 = 1412^2 + 1370^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3870644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3870649) 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, 12929 + ... + 13224.

It is an arithmetic number, because the mean of its divisors is an integer number (579747).

Almost surely, 2^3870644 is an apocalyptic number.

It is an amenable number.

3870644 is a deficient number, since it is larger than the sum of its proper divisors (3086320).

3870644 is a wasteful number, since it uses less digits than its factorization.

3870644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26194 (or 26192 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 3870644 is about 1967.3952322805. The cubic root of 3870644 is about 157.0101552656.

The spelling of 3870644 in words is "three million, eight hundred seventy thousand, six hundred forty-four".