1617790986 has 96 divisors (see below), whose sum is σ = 4353024000. Its totient is φ = 423753120.

The previous prime is 1617790963. The next prime is 1617791011. The reversal of 1617790986 is 6890977161.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 in 47 ways as a sum of consecutive naturals, for example, 63315 + ... + 85113.

It is an arithmetic number, because the mean of its divisors is an integer number (45344000).

Almost surely, 2^1617790986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1617790986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2176512000).

1617790986 is an abundant number, since it is smaller than the sum of its proper divisors (2735233014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1617790986 is a wasteful number, since it uses less digits than its factorization.

1617790986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21864 (or 21861 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The square root of 1617790986 is about 40221.7725367742. The cubic root of 1617790986 is about 1173.9262225248.

The spelling of 1617790986 in words is "one billion, six hundred seventeen million, seven hundred ninety thousand, nine hundred eighty-six".