689830387 has 2 divisors, whose sum is σ = 689830388. Its totient is φ = 689830386.

The previous prime is 689830373. The next prime is 689830399. The reversal of 689830387 is 783038986.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689830387 - 2¹¹ = 689828339 is a prime.

It is not a weakly prime, because it can be changed into another prime (689830187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344915193 + 344915194.

It is an arithmetic number, because the mean of its divisors is an integer number (344915194).

Almost surely, 2^689830387 is an apocalyptic number.

689830387 is a deficient number, since it is larger than the sum of its proper divisors (1).

689830387 is an equidigital number, since it uses as much as digits as its factorization.

689830387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The square root of 689830387 is about 26264.6223464188. The cubic root of 689830387 is about 883.5831807628.

The spelling of 689830387 in words is "six hundred eighty-nine million, eight hundred thirty thousand, three hundred eighty-seven".