477728921 has 2 divisors, whose sum is σ = 477728922. Its totient is φ = 477728920.

The previous prime is 477728903. The next prime is 477728971. The reversal of 477728921 is 129827774.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404814400 + 72914521 = 20120^2 + 8539^2 .

It is a cyclic number.

It is not a de Polignac number, because 477728921 - 2¹⁴ = 477712537 is a prime.

It is not a weakly prime, because it can be changed into another prime (477728971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238864460 + 238864461.

It is an arithmetic number, because the mean of its divisors is an integer number (238864461).

Almost surely, 2^477728921 is an apocalyptic number.

It is an amenable number.

477728921 is a deficient number, since it is larger than the sum of its proper divisors (1).

477728921 is an equidigital number, since it uses as much as digits as its factorization.

477728921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 47.

The square root of 477728921 is about 21857.0107974535. The cubic root of 477728921 is about 781.7367181009.

The spelling of 477728921 in words is "four hundred seventy-seven million, seven hundred twenty-eight thousand, nine hundred twenty-one".