7438 has 4 divisors (see below), whose sum is σ = 11160. Its totient is φ = 3718.

The previous prime is 7433. The next prime is 7451. The reversal of 7438 is 8347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8347 = 17 ⋅491.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7433) by changing a digit.

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, 1858 + ... + 1861.

It is an arithmetic number, because the mean of its divisors is an integer number (2790).

2⁷⁴³⁸ is an apocalyptic number.

7438 is a deficient number, since it is larger than the sum of its proper divisors (3722).

7438 is a wasteful number, since it uses less digits than its factorization.

7438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3721.

The product of its digits is 672, while the sum is 22.

The square root of 7438 is about 86.2438403598. The cubic root of 7438 is about 19.5202507134.

Subtracting 7438 from its reverse (8347), we obtain a palindrome (909).

The spelling of 7438 in words is "seven thousand, four hundred thirty-eight".