7438421 has 4 divisors (see below), whose sum is σ = 7476000. Its totient is φ = 7400844.

The previous prime is 7438399. The next prime is 7438423. The reversal of 7438421 is 1248347.

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 7438421 - 2¹⁸ = 7176277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7438423) 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, 18491 + ... + 18888.

It is an arithmetic number, because the mean of its divisors is an integer number (1869000).

Almost surely, 2^7438421 is an apocalyptic number.

It is an amenable number.

7438421 is a deficient number, since it is larger than the sum of its proper divisors (37579).

7438421 is a wasteful number, since it uses less digits than its factorization.

7438421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37578.

The product of its digits is 5376, while the sum is 29.

The square root of 7438421 is about 2727.3468792950. The cubic root of 7438421 is about 195.2061899660.

The spelling of 7438421 in words is "seven million, four hundred thirty-eight thousand, four hundred twenty-one".