1688018489 has 8 divisors (see below), whose sum is σ = 1733467008. Its totient is φ = 1642967280.

The previous prime is 1688018441. The next prime is 1688018491. The reversal of 1688018489 is 9848108861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1688018489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1688018489.

It is not an unprimeable number, because it can be changed into a prime (1688018419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90707 + ... + 107720.

It is an arithmetic number, because the mean of its divisors is an integer number (216683376).

Almost surely, 2^1688018489 is an apocalyptic number.

It is an amenable number.

1688018489 is a deficient number, since it is larger than the sum of its proper divisors (45448519).

1688018489 is a wasteful number, since it uses less digits than its factorization.

1688018489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198655.

The product of its (nonzero) digits is 884736, while the sum is 53.

The square root of 1688018489 is about 41085.5021753416. The cubic root of 1688018489 is about 1190.6727098211.

The spelling of 1688018489 in words is "one billion, six hundred eighty-eight million, eighteen thousand, four hundred eighty-nine".