477721 has 2 divisors, whose sum is σ = 477722. Its totient is φ = 477720.

The previous prime is 477677. The next prime is 477727. The reversal of 477721 is 127774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409600 + 68121 = 640^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 477721 - 2⁷ = 477593 is a prime.

It is an Ulam number.

It is equal to p₃₉₈₂₆ and since 477721 and 39826 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 477721.

It is not a weakly prime, because it can be changed into another prime (477727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238860 + 238861.

It is an arithmetic number, because the mean of its divisors is an integer number (238861).

2⁴⁷⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

477721 is a deficient number, since it is larger than the sum of its proper divisors (1).

477721 is an equidigital number, since it uses as much as digits as its factorization.

477721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2744, while the sum is 28.

The square root of 477721 is about 691.1736395436. The cubic root of 477721 is about 78.1732397540.

The spelling of 477721 in words is "four hundred seventy-seven thousand, seven hundred twenty-one", and thus it is an iban number.