19430250840 has 768 divisors, whose sum is σ = 87970821120. Its totient is φ = 3725015040.

The previous prime is 19430250817. The next prime is 19430250869. The reversal of 19430250840 is 4805203491.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19430250795 and 19430250804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 9728722 + ... + 9730718.

It is an arithmetic number, because the mean of its divisors is an integer number (114545340).

Almost surely, 2^19430250840 is an apocalyptic number.

19430250840 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 19430250840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43985410560).

19430250840 is an abundant number, since it is smaller than the sum of its proper divisors (68540570280).

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

19430250840 is a wasteful number, since it uses less digits than its factorization.

19430250840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054 (or 2038 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 19430250840 in words is "nineteen billion, four hundred thirty million, two hundred fifty thousand, eight hundred forty".