1980927717 has 16 divisors (see below), whose sum is σ = 2677257408. Its totient is φ = 1302658560.

The previous prime is 1980927709. The next prime is 1980927721. The reversal of 1980927717 is 7177290891.

It is a happy number.

It is not a de Polignac number, because 1980927717 - 2³ = 1980927709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1980927717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980927757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161667 + ... + 173487.

It is an arithmetic number, because the mean of its divisors is an integer number (167328588).

Almost surely, 2^1980927717 is an apocalyptic number.

It is an amenable number.

1980927717 is a deficient number, since it is larger than the sum of its proper divisors (696329691).

1980927717 is a wasteful number, since it uses less digits than its factorization.

1980927717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12580.

The product of its (nonzero) digits is 444528, while the sum is 51.

The square root of 1980927717 is about 44507.6141463458. The cubic root of 1980927717 is about 1255.9033230269.

The spelling of 1980927717 in words is "one billion, nine hundred eighty million, nine hundred twenty-seven thousand, seven hundred seventeen".