7479821 has 2 divisors, whose sum is σ = 7479822. Its totient is φ = 7479820.

The previous prime is 7479817. The next prime is 7479839. The reversal of 7479821 is 1289747.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7214596 + 265225 = 2686^2 + 515^2 .

It is an emirp because it is prime and its reverse (1289747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7479821 - 2² = 7479817 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7479811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3739910 + 3739911.

It is an arithmetic number, because the mean of its divisors is an integer number (3739911).

Almost surely, 2^7479821 is an apocalyptic number.

It is an amenable number.

7479821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7479821 is an equidigital number, since it uses as much as digits as its factorization.

7479821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 38.

The square root of 7479821 is about 2734.9261415987. The cubic root of 7479821 is about 195.5676730157.

The spelling of 7479821 in words is "seven million, four hundred seventy-nine thousand, eight hundred twenty-one".