478796921 has 2 divisors, whose sum is σ = 478796922. Its totient is φ = 478796920.

The previous prime is 478796881. The next prime is 478796951. The reversal of 478796921 is 129697874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376786921 + 102010000 = 19411^2 + 10100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478796921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (478796951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239398460 + 239398461.

It is an arithmetic number, because the mean of its divisors is an integer number (239398461).

Almost surely, 2^478796921 is an apocalyptic number.

It is an amenable number.

478796921 is a deficient number, since it is larger than the sum of its proper divisors (1).

478796921 is an equidigital number, since it uses as much as digits as its factorization.

478796921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The square root of 478796921 is about 21881.4286782193. The cubic root of 478796921 is about 782.3188288562.

The spelling of 478796921 in words is "four hundred seventy-eight million, seven hundred ninety-six thousand, nine hundred twenty-one".