19786494240 has 384 divisors, whose sum is σ = 71425670400. Its totient is φ = 5113405440.

The previous prime is 19786494239. The next prime is 19786494241. The reversal of 19786494240 is 4249468791.

It is an interprime number because it is at equal distance from previous prime (19786494239) and next prime (19786494241).

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

It is not an unprimeable number, because it can be changed into a prime (19786494241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20376955 + ... + 20377925.

It is an arithmetic number, because the mean of its divisors is an integer number (186004350).

Almost surely, 2^19786494240 is an apocalyptic number.

19786494240 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 19786494240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35712835200).

19786494240 is an abundant number, since it is smaller than the sum of its proper divisors (51639176160).

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

19786494240 is a wasteful number, since it uses less digits than its factorization.

19786494240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137 (or 1123 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 19786494240 in words is "nineteen billion, seven hundred eighty-six million, four hundred ninety-four thousand, two hundred forty".