209796487 has 2 divisors, whose sum is σ = 209796488. Its totient is φ = 209796486.

The previous prime is 209796463. The next prime is 209796491. The reversal of 209796487 is 784697902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209796487 - 2¹⁹ = 209272199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209796287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104898243 + 104898244.

It is an arithmetic number, because the mean of its divisors is an integer number (104898244).

Almost surely, 2^209796487 is an apocalyptic number.

209796487 is a deficient number, since it is larger than the sum of its proper divisors (1).

209796487 is an equidigital number, since it uses as much as digits as its factorization.

209796487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The square root of 209796487 is about 14484.3531785165. The cubic root of 209796487 is about 594.2001228374.

The spelling of 209796487 in words is "two hundred nine million, seven hundred ninety-six thousand, four hundred eighty-seven".