1438381 has 4 divisors (see below), whose sum is σ = 1643872. Its totient is φ = 1232892.

The previous prime is 1438379. The next prime is 1438399. The reversal of 1438381 is 1838341.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1438381 - 2¹ = 1438379 is a prime.

It is a super-2 number, since 2×1438381² = 4137879802322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438181) 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, 102735 + ... + 102748.

It is an arithmetic number, because the mean of its divisors is an integer number (410968).

2^1438381 is an apocalyptic number.

It is an amenable number.

1438381 is a deficient number, since it is larger than the sum of its proper divisors (205491).

1438381 is an equidigital number, since it uses as much as digits as its factorization.

1438381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205490.

The product of its digits is 2304, while the sum is 28.

The square root of 1438381 is about 1199.3252269506. The cubic root of 1438381 is about 112.8819871140.

The spelling of 1438381 in words is "one million, four hundred thirty-eight thousand, three hundred eighty-one".