19747998 has 12 divisors (see below), whose sum is σ = 42787368. Its totient is φ = 6582660.

The previous prime is 19747997. The next prime is 19748009. The reversal of 19747998 is 89974791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19747991) 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 5 ways as a sum of consecutive naturals, for example, 548538 + ... + 548573.

It is an arithmetic number, because the mean of its divisors is an integer number (3565614).

Almost surely, 2^19747998 is an apocalyptic number.

19747998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19747998 is an abundant number, since it is smaller than the sum of its proper divisors (23039370).

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

19747998 is a wasteful number, since it uses less digits than its factorization.

19747998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097119 (or 1097116 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 19747998 is about 4443.8719603517. The cubic root of 19747998 is about 270.2968751012.

The spelling of 19747998 in words is "nineteen million, seven hundred forty-seven thousand, nine hundred ninety-eight".