19980499 has 16 divisors (see below), whose sum is σ = 25445376. Its totient is φ = 15235200.

The previous prime is 19980487. The next prime is 19980503. The reversal of 19980499 is 99408991.

It is a cyclic number.

It is not a de Polignac number, because 19980499 - 2⁹ = 19979987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19980469) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 859 + ... + 6379.

It is an arithmetic number, because the mean of its divisors is an integer number (1590336).

Almost surely, 2^19980499 is an apocalyptic number.

19980499 is a deficient number, since it is larger than the sum of its proper divisors (5464877).

19980499 is a wasteful number, since it uses less digits than its factorization.

19980499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5586.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 19980499 is about 4469.9551451888. The cubic root of 19980499 is about 271.3535098734.

The spelling of 19980499 in words is "nineteen million, nine hundred eighty thousand, four hundred ninety-nine".