19684998 has 16 divisors (see below), whose sum is σ = 43744560. Its totient is φ = 6561648.

The previous prime is 19684993. The next prime is 19685009. The reversal of 19684998 is 89948691.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 364537 = 19684998 / (1 + 9 + 6 + 8 + 4 + 9 + 9 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19684991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182215 + ... + 182322.

It is an arithmetic number, because the mean of its divisors is an integer number (2734035).

Almost surely, 2^19684998 is an apocalyptic number.

19684998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19684998 is an abundant number, since it is smaller than the sum of its proper divisors (24059562).

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

19684998 is a wasteful number, since it uses less digits than its factorization.

19684998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364548 (or 364542 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 19684998 is about 4436.7778849070. Note that the first 3 decimals coincide. The cubic root of 19684998 is about 270.0091354934.

The spelling of 19684998 in words is "nineteen million, six hundred eighty-four thousand, nine hundred ninety-eight".