7321638 has 16 divisors (see below), whose sum is σ = 14670000. Its totient is φ = 2436096.

The previous prime is 7321627. The next prime is 7321661. The reversal of 7321638 is 8361237.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5238 + ... + 6486.

It is an arithmetic number, because the mean of its divisors is an integer number (916875).

Almost surely, 2^7321638 is an apocalyptic number.

7321638 is an abundant number, since it is smaller than the sum of its proper divisors (7348362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7321638 is a wasteful number, since it uses less digits than its factorization.

7321638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231.

The product of its digits is 6048, while the sum is 30.

The square root of 7321638 is about 2705.8525458716. The cubic root of 7321638 is about 194.1792193702.

The spelling of 7321638 in words is "seven million, three hundred twenty-one thousand, six hundred thirty-eight".