19998495 has 60 divisors (see below), whose sum is σ = 39700584. Its totient is φ = 9551520.

The previous prime is 19998491. The next prime is 19998497. The reversal of 19998495 is 59489991.

It is not a de Polignac number, because 19998495 - 2² = 19998491 is a prime.

Its product of digits (1049760) is a multiple of the sum of its prime factors (162).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998491) 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 59 ways as a sum of consecutive naturals, for example, 298452 + ... + 298518.

Almost surely, 2^19998495 is an apocalyptic number.

19998495 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19998495 is a deficient number, since it is larger than the sum of its proper divisors (19702089).

19998495 is an equidigital number, since it uses as much as digits as its factorization.

19998495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 86 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 19998495 is about 4471.9676877187. The cubic root of 19998495 is about 271.4349528245.

The spelling of 19998495 in words is "nineteen million, nine hundred ninety-eight thousand, four hundred ninety-five".