19988455 has 8 divisors (see below), whose sum is σ = 24139872. Its totient is φ = 15888288.

The previous prime is 19988429. The next prime is 19988461. The reversal of 19988455 is 55488991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19988455 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19988399 and 19988408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11947 + ... + 13516.

It is an arithmetic number, because the mean of its divisors is an integer number (3017484).

Almost surely, 2^19988455 is an apocalyptic number.

19988455 is a deficient number, since it is larger than the sum of its proper divisors (4151417).

19988455 is a wasteful number, since it uses less digits than its factorization.

19988455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25625.

The product of its digits is 518400, while the sum is 49.

The square root of 19988455 is about 4470.8449984315. The cubic root of 19988455 is about 271.3895216874.

The spelling of 19988455 in words is "nineteen million, nine hundred eighty-eight thousand, four hundred fifty-five".