19147840 has 56 divisors (see below), whose sum is σ = 46497240. Its totient is φ = 7507968.

The previous prime is 19147837. The next prime is 19147873. The reversal of 19147840 is 4874191.

It can be written as a sum of positive squares in 4 ways, for example, as 692224 + 18455616 = 832^2 + 4296^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19147796 and 19147805.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16396 + ... + 17524.

Almost surely, 2^19147840 is an apocalyptic number.

19147840 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 19147840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23248620).

19147840 is an abundant number, since it is smaller than the sum of its proper divisors (27349400).

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

19147840 is a wasteful number, since it uses less digits than its factorization.

19147840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199 (or 1189 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 19147840 is about 4375.8244937383. The cubic root of 19147840 is about 267.5304766278.

The spelling of 19147840 in words is "nineteen million, one hundred forty-seven thousand, eight hundred forty".