19690398 has 64 divisors (see below), whose sum is σ = 53867520. Its totient is φ = 5191776.

The previous prime is 19690397. The next prime is 19690399. The reversal of 19690398 is 89309691.

It is an interprime number because it is at equal distance from previous prime (19690397) and next prime (19690399).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19690393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2911 + ... + 6917.

It is an arithmetic number, because the mean of its divisors is an integer number (841680).

Almost surely, 2^19690398 is an apocalyptic number.

19690398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19690398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26933760).

19690398 is an abundant number, since it is smaller than the sum of its proper divisors (34177122).

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

19690398 is a wasteful number, since it uses less digits than its factorization.

19690398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4038 (or 4032 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 19690398 is about 4437.3863929119. The cubic root of 19690398 is about 270.0338229233.

The spelling of 19690398 in words is "nineteen million, six hundred ninety thousand, three hundred ninety-eight".