7478321 has 4 divisors (see below), whose sum is σ = 7486500. Its totient is φ = 7470144.

The previous prime is 7478299. The next prime is 7478327. The reversal of 7478321 is 1238747.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5880625 + 1597696 = 2425^2 + 1264^2 .

It is a cyclic number.

It is not a de Polignac number, because 7478321 - 2⁶ = 7478257 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7478327) 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, 2516 + ... + 4613.

It is an arithmetic number, because the mean of its divisors is an integer number (1871625).

Almost surely, 2^7478321 is an apocalyptic number.

It is an amenable number.

7478321 is a deficient number, since it is larger than the sum of its proper divisors (8179).

7478321 is a wasteful number, since it uses less digits than its factorization.

7478321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8178.

The product of its digits is 9408, while the sum is 32.

The square root of 7478321 is about 2734.6518974085. The cubic root of 7478321 is about 195.5545991234.

The spelling of 7478321 in words is "seven million, four hundred seventy-eight thousand, three hundred twenty-one".