19397934864 has 320 divisors, whose sum is σ = 73503866880. Its totient is φ = 4741908480.

The previous prime is 19397934839. The next prime is 19397934901. The reversal of 19397934864 is 46843979391.

It is a super-3 number, since 3×19397934864³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 548337 + ... + 582639.

It is an arithmetic number, because the mean of its divisors is an integer number (229699584).

Almost surely, 2^19397934864 is an apocalyptic number.

19397934864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19397934864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36751933440).

19397934864 is an abundant number, since it is smaller than the sum of its proper divisors (54105932016).

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

19397934864 is a wasteful number, since it uses less digits than its factorization.

19397934864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34355 (or 34343 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 63.

The spelling of 19397934864 in words is "nineteen billion, three hundred ninety-seven million, nine hundred thirty-four thousand, eight hundred sixty-four".