1688371852 has 6 divisors (see below), whose sum is σ = 2954650748. Its totient is φ = 844185924.

The previous prime is 1688371849. The next prime is 1688371859. The reversal of 1688371852 is 2581738861.

It is a junction number, because it is equal to n+sod(n) for n = 1688371796 and 1688371805.

It is not an unprimeable number, because it can be changed into a prime (1688371859) 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, 211046478 + ... + 211046485.

Almost surely, 2^1688371852 is an apocalyptic number.

It is an amenable number.

1688371852 is a deficient number, since it is larger than the sum of its proper divisors (1266278896).

1688371852 is a wasteful number, since it uses less digits than its factorization.

1688371852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422092967 (or 422092965 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The square root of 1688371852 is about 41089.8022871856. The cubic root of 1688371852 is about 1190.7557875694.

The spelling of 1688371852 in words is "one billion, six hundred eighty-eight million, three hundred seventy-one thousand, eight hundred fifty-two".