19800939 has 8 divisors (see below), whose sum is σ = 27311760. Its totient is φ = 12745376.

The previous prime is 19800929. The next prime is 19800961. The reversal of 19800939 is 93900891.

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

It is a cyclic number.

It is not a de Polignac number, because 19800939 - 2⁷ = 19800811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19800897 and 19800906.

It is not an unprimeable number, because it can be changed into a prime (19800929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113712 + ... + 113885.

It is an arithmetic number, because the mean of its divisors is an integer number (3413970).

Almost surely, 2^19800939 is an apocalyptic number.

19800939 is a deficient number, since it is larger than the sum of its proper divisors (7510821).

19800939 is a wasteful number, since it uses less digits than its factorization.

19800939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227629.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 19800939 is about 4449.8246032849. The cubic root of 19800939 is about 270.5381994540.

The spelling of 19800939 in words is "nineteen million, eight hundred thousand, nine hundred thirty-nine".