19394426472 has 256 divisors, whose sum is σ = 55883520000. Its totient is φ = 5570519040.

The previous prime is 19394426449. The next prime is 19394426501. The reversal of 19394426472 is 27462449391.

It is a happy number.

It is a super-2 number, since 2×19394426472² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 44178429 + ... + 44178867.

It is an arithmetic number, because the mean of its divisors is an integer number (218295000).

Almost surely, 2^19394426472 is an apocalyptic number.

19394426472 is a gapful number since it is divisible by the number (12) 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 19394426472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27941760000).

19394426472 is an abundant number, since it is smaller than the sum of its proper divisors (36489093528).

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

19394426472 is a wasteful number, since it uses less digits than its factorization.

19394426472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 660 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 51.

The spelling of 19394426472 in words is "nineteen billion, three hundred ninety-four million, four hundred twenty-six thousand, four hundred seventy-two".