689899393 has 2 divisors, whose sum is σ = 689899394. Its totient is φ = 689899392.

The previous prime is 689899349. The next prime is 689899409. The reversal of 689899393 is 393998986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 428365809 + 261533584 = 20697^2 + 16172^2 .

It is a cyclic number.

It is not a de Polignac number, because 689899393 - 2¹³ = 689891201 is a prime.

It is a super-2 number, since 2×689899393² = 951922344923536898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (689899313) 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, 344949696 + 344949697.

It is an arithmetic number, because the mean of its divisors is an integer number (344949697).

Almost surely, 2^689899393 is an apocalyptic number.

It is an amenable number.

689899393 is a deficient number, since it is larger than the sum of its proper divisors (1).

689899393 is an equidigital number, since it uses as much as digits as its factorization.

689899393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22674816, while the sum is 64.

The square root of 689899393 is about 26265.9359817997. The cubic root of 689899393 is about 883.6126423566.

The spelling of 689899393 in words is "six hundred eighty-nine million, eight hundred ninety-nine thousand, three hundred ninety-three".