19965798 has 32 divisors (see below), whose sum is σ = 45803520. Its totient is φ = 6440040.

The previous prime is 19965787. The next prime is 19965809. The reversal of 19965798 is 89756991.

It is an interprime number because it is at equal distance from previous prime (19965787) and next prime (19965809).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4290 + ... + 7637.

It is an arithmetic number, because the mean of its divisors is an integer number (1431360).

Almost surely, 2^19965798 is an apocalyptic number.

19965798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19965798 is an abundant number, since it is smaller than the sum of its proper divisors (25837722).

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

19965798 is a wasteful number, since it uses less digits than its factorization.

19965798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11969 (or 11963 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 19965798 is about 4468.3104189391. The cubic root of 19965798 is about 271.2869425217.

The spelling of 19965798 in words is "nineteen million, nine hundred sixty-five thousand, seven hundred ninety-eight".