4381639 has 4 divisors (see below), whose sum is σ = 4532760. Its totient is φ = 4230520.

The previous prime is 4381607. The next prime is 4381667. The reversal of 4381639 is 9361834.

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

It is not a de Polignac number, because 4381639 - 2⁵ = 4381607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4381739) 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, 75517 + ... + 75574.

It is an arithmetic number, because the mean of its divisors is an integer number (1133190).

Almost surely, 2^4381639 is an apocalyptic number.

4381639 is a deficient number, since it is larger than the sum of its proper divisors (151121).

4381639 is a wasteful number, since it uses less digits than its factorization.

4381639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151120.

The product of its digits is 15552, while the sum is 34.

The square root of 4381639 is about 2093.2364892673. The cubic root of 4381639 is about 163.6360036374.

The spelling of 4381639 in words is "four million, three hundred eighty-one thousand, six hundred thirty-nine".