489640397 has 2 divisors, whose sum is σ = 489640398. Its totient is φ = 489640396.

The previous prime is 489640387. The next prime is 489640483. The reversal of 489640397 is 793046984.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 327103396 + 162537001 = 18086^2 + 12749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-489640397 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 (489640357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244820198 + 244820199.

It is an arithmetic number, because the mean of its divisors is an integer number (244820199).

Almost surely, 2^489640397 is an apocalyptic number.

It is an amenable number.

489640397 is a deficient number, since it is larger than the sum of its proper divisors (1).

489640397 is an equidigital number, since it uses as much as digits as its factorization.

489640397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 489640397 is about 22127.8195265598. The cubic root of 489640397 is about 788.1806109621.

The spelling of 489640397 in words is "four hundred eighty-nine million, six hundred forty thousand, three hundred ninety-seven".