1688693492 has 12 divisors (see below), whose sum is σ = 2962660260. Its totient is φ = 842219136.

The previous prime is 1688693491. The next prime is 1688693543. The reversal of 1688693492 is 2943968861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 420906256 + 1267787236 = 20516^2 + 35606^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688693491) 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 in 3 ways as a sum of consecutive naturals, for example, 530117 + ... + 533292.

It is an arithmetic number, because the mean of its divisors is an integer number (246888355).

Almost surely, 2^1688693492 is an apocalyptic number.

It is an amenable number.

1688693492 is a deficient number, since it is larger than the sum of its proper divisors (1273966768).

1688693492 is a wasteful number, since it uses less digits than its factorization.

1688693492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063810 (or 1063808 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 56.

The square root of 1688693492 is about 41093.7159672863. The cubic root of 1688693492 is about 1190.8313969745.

The spelling of 1688693492 in words is "one billion, six hundred eighty-eight million, six hundred ninety-three thousand, four hundred ninety-two".