1687383797 has 8 divisors (see below), whose sum is σ = 1842488832. Its totient is φ = 1532563200.

The previous prime is 1687383791. The next prime is 1687383829. The reversal of 1687383797 is 7973837861.

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-1687383797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687383791) 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, 58604 + ... + 82517.

It is an arithmetic number, because the mean of its divisors is an integer number (230311104).

Almost surely, 2^1687383797 is an apocalyptic number.

It is an amenable number.

1687383797 is a deficient number, since it is larger than the sum of its proper divisors (155105035).

1687383797 is a wasteful number, since it uses less digits than its factorization.

1687383797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142219.

The product of its digits is 10668672, while the sum is 59.

The square root of 1687383797 is about 41077.7774106633. Note that the first 3 decimals coincide. The cubic root of 1687383797 is about 1190.5234608282.

The spelling of 1687383797 in words is "one billion, six hundred eighty-seven million, three hundred eighty-three thousand, seven hundred ninety-seven".