19809477000 has 192 divisors, whose sum is σ = 67241219760. Its totient is φ = 5260032000.

The previous prime is 19809476987. The next prime is 19809477011. The reversal of 19809477000 is 77490891.

It can be written as a sum of positive squares in 8 ways, for example, as 4100865444 + 15708611556 = 64038^2 + 125334^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2164434 + ... + 2173566.

Almost surely, 2^19809477000 is an apocalyptic number.

19809477000 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 19809477000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33620609880).

19809477000 is an abundant number, since it is smaller than the sum of its proper divisors (47431742760).

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

19809477000 is a wasteful number, since it uses less digits than its factorization.

19809477000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9401 (or 9384 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The spelling of 19809477000 in words is "nineteen billion, eight hundred nine million, four hundred seventy-seven thousand".