19663398 has 20 divisors (see below), whose sum is σ = 44060940. Its totient is φ = 6554412.

The previous prime is 19663351. The next prime is 19663403. The reversal of 19663398 is 89336691.

19663398 is a `hidden beast` number, since 1 + 9 + 6 + 633 + 9 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 60528 + ... + 60851.

It is an arithmetic number, because the mean of its divisors is an integer number (2203047).

Almost surely, 2^19663398 is an apocalyptic number.

19663398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19663398 is an abundant number, since it is smaller than the sum of its proper divisors (24397542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19663398 is a wasteful number, since it uses less digits than its factorization.

19663398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121393 (or 121384 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 19663398 is about 4434.3430178551. The cubic root of 19663398 is about 269.9103406003.

The spelling of 19663398 in words is "nineteen million, six hundred sixty-three thousand, three hundred ninety-eight".