7318421 has 4 divisors (see below), whose sum is σ = 7983744. Its totient is φ = 6653100.

The previous prime is 7318397. The next prime is 7318429. The reversal of 7318421 is 1248137.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1248137 = 11 ⋅113467.

It is a cyclic number.

It is not a de Polignac number, because 7318421 - 2¹⁰ = 7317397 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 (7318429) 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, 332645 + ... + 332666.

It is an arithmetic number, because the mean of its divisors is an integer number (1995936).

Almost surely, 2^7318421 is an apocalyptic number.

It is an amenable number.

7318421 is a deficient number, since it is larger than the sum of its proper divisors (665323).

7318421 is a wasteful number, since it uses less digits than its factorization.

7318421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665322.

The product of its digits is 1344, while the sum is 26.

The square root of 7318421 is about 2705.2580283588. The cubic root of 7318421 is about 194.1507755501.

The spelling of 7318421 in words is "seven million, three hundred eighteen thousand, four hundred twenty-one".