19980859 has 12 divisors (see below), whose sum is σ = 21142296. Its totient is φ = 18879872.

The previous prime is 19980823. The next prime is 19980869. The reversal of 19980859 is 95808991.

It is a happy number.

It is not a de Polignac number, because 19980859 - 2⁹ = 19980347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19980809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56427 + ... + 56779.

It is an arithmetic number, because the mean of its divisors is an integer number (1761858).

Almost surely, 2^19980859 is an apocalyptic number.

19980859 is a deficient number, since it is larger than the sum of its proper divisors (1161437).

19980859 is a wasteful number, since it uses less digits than its factorization.

19980859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 49.

The square root of 19980859 is about 4469.9954138679. The cubic root of 19980859 is about 271.3551395737.

The spelling of 19980859 in words is "nineteen million, nine hundred eighty thousand, eight hundred fifty-nine".