4381945 has 8 divisors (see below), whose sum is σ = 5297544. Its totient is φ = 3479424.

The previous prime is 4381939. The next prime is 4381961. The reversal of 4381945 is 5491834.

It can be written as a sum of positive squares in 4 ways, for example, as 1296 + 4380649 = 36^2 + 2093^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4381945 is a prime.

It is a Duffinian number.

4381945 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4381945.

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 in 7 ways as a sum of consecutive naturals, for example, 2514 + ... + 3883.

It is an arithmetic number, because the mean of its divisors is an integer number (662193).

Almost surely, 2^4381945 is an apocalyptic number.

It is an amenable number.

4381945 is a deficient number, since it is larger than the sum of its proper divisors (915599).

4381945 is a wasteful number, since it uses less digits than its factorization.

4381945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6539.

The product of its digits is 17280, while the sum is 34.

The square root of 4381945 is about 2093.3095805446. The cubic root of 4381945 is about 163.6398128248.

The spelling of 4381945 in words is "four million, three hundred eighty-one thousand, nine hundred forty-five".