Cookie Consent by
Search a number
1438 = 2719

1438 has 4 divisors (see below), whose sum is σ = 2160. Its totient is φ = 718.

The previous prime is 1433. The next prime is 1439. The reversal of 1438 is 8341.

1438 is nontrivially palindromic in base 13.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8341 = 19439.

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

1438 is an undulating number in base 13.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1433) by changing a digit.

1438 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358 + ... + 361.

It is an arithmetic number, because the mean of its divisors is an integer number (540).

21438 is an apocalyptic number.

1438 is a deficient number, since it is larger than the sum of its proper divisors (722).

1438 is an equidigital number, since it uses as much as digits as its factorization.

1438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721.

The product of its digits is 96, while the sum is 16.

The square root of 1438 is about 37.9209704517. The cubic root of 1438 is about 11.2872019464.

Adding to 1438 its reverse (8341), we get a palindrome (9779).

Subtracting 1438 from its reverse (8341), we obtain a triangular number (6903 = T117).

It can be divided in two parts, 143 and 8, that added together give a palindrome (151).

The spelling of 1438 in words is "one thousand, four hundred thirty-eight".

Divisors: 1 2 719 1438