476643989 has 2 divisors, whose sum is σ = 476643990. Its totient is φ = 476643988.

The previous prime is 476643911. The next prime is 476644009. The reversal of 476643989 is 989346674.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377641489 + 99002500 = 19433^2 + 9950^2 .

It is a cyclic number.

It is not a de Polignac number, because 476643989 - 2²⁴ = 459866773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (476643289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238321994 + 238321995.

It is an arithmetic number, because the mean of its divisors is an integer number (238321995).

Almost surely, 2^476643989 is an apocalyptic number.

It is an amenable number.

476643989 is a deficient number, since it is larger than the sum of its proper divisors (1).

476643989 is an equidigital number, since it uses as much as digits as its factorization.

476643989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 56.

The square root of 476643989 is about 21832.1778345634. The cubic root of 476643989 is about 781.1444896103.

The spelling of 476643989 in words is "four hundred seventy-six million, six hundred forty-three thousand, nine hundred eighty-nine".