4381649 has 4 divisors (see below), whose sum is σ = 4386660. Its totient is φ = 4376640.

The previous prime is 4381607. The next prime is 4381667. The reversal of 4381649 is 9461834.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1423249 + 2958400 = 1193^2 + 1720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4381649 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4381049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812 + ... + 3069.

It is an arithmetic number, because the mean of its divisors is an integer number (1096665).

Almost surely, 2^4381649 is an apocalyptic number.

It is an amenable number.

4381649 is a deficient number, since it is larger than the sum of its proper divisors (5011).

4381649 is a wasteful number, since it uses less digits than its factorization.

4381649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010.

The product of its digits is 20736, while the sum is 35.

The square root of 4381649 is about 2093.2388779115. The cubic root of 4381649 is about 163.6361281235.

The spelling of 4381649 in words is "four million, three hundred eighty-one thousand, six hundred forty-nine".