19397898240 has 832 divisors, whose sum is σ = 77450950656. Its totient is φ = 4048551936.

The previous prime is 19397898239. The next prime is 19397898253. The reversal of 19397898240 is 4289879391.

It is a super-4 number, since 4×19397898240⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

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, 365998054 + ... + 365998106.

Almost surely, 2^19397898240 is an apocalyptic number.

19397898240 is a gapful number since it is divisible by the number (10) 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 19397898240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38725475328).

19397898240 is an abundant number, since it is smaller than the sum of its proper divisors (58053052416).

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

19397898240 is a wasteful number, since it uses less digits than its factorization.

19397898240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 60.

The spelling of 19397898240 in words is "nineteen billion, three hundred ninety-seven million, eight hundred ninety-eight thousand, two hundred forty".