19857982 has 8 divisors (see below), whose sum is σ = 30814200. Its totient is φ = 9586584.

The previous prime is 19857979. The next prime is 19857997. The reversal of 19857982 is 28975891.

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

It is a super-2 number, since 2×19857982² = 788678898224648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171132 + ... + 171247.

It is an arithmetic number, because the mean of its divisors is an integer number (3851775).

Almost surely, 2^19857982 is an apocalyptic number.

19857982 is a deficient number, since it is larger than the sum of its proper divisors (10956218).

19857982 is a wasteful number, since it uses less digits than its factorization.

19857982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342410.

The product of its digits is 362880, while the sum is 49.

The square root of 19857982 is about 4456.2295721832. The cubic root of 19857982 is about 270.7977412689.

The spelling of 19857982 in words is "nineteen million, eight hundred fifty-seven thousand, nine hundred eighty-two".