3840639 has 16 divisors (see below), whose sum is σ = 5625984. Its totient is φ = 2311200.

The previous prime is 3840601. The next prime is 3840647. The reversal of 3840639 is 9360483.

It is not a de Polignac number, because 3840639 - 2⁹ = 3840127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3840649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5652 + ... + 6294.

It is an arithmetic number, because the mean of its divisors is an integer number (351624).

Almost surely, 2^3840639 is an apocalyptic number.

3840639 is a deficient number, since it is larger than the sum of its proper divisors (1785345).

3840639 is a wasteful number, since it uses less digits than its factorization.

3840639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 3840639 is about 1959.7548316052. The cubic root of 3840639 is about 156.6033912776.

Subtracting from 3840639 its sum of digits (33), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 3840639 in words is "three million, eight hundred forty thousand, six hundred thirty-nine".