689969927 has 2 divisors, whose sum is σ = 689969928. Its totient is φ = 689969926.

The previous prime is 689969923. The next prime is 689969957. The reversal of 689969927 is 729969986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689969927 - 2² = 689969923 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689969923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344984963 + 344984964.

It is an arithmetic number, because the mean of its divisors is an integer number (344984964).

Almost surely, 2^689969927 is an apocalyptic number.

689969927 is a deficient number, since it is larger than the sum of its proper divisors (1).

689969927 is an equidigital number, since it uses as much as digits as its factorization.

689969927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26453952, while the sum is 65.

The square root of 689969927 is about 26267.2786371181. The cubic root of 689969927 is about 883.6427542883.

The spelling of 689969927 in words is "six hundred eighty-nine million, nine hundred sixty-nine thousand, nine hundred twenty-seven".