19216740 has 48 divisors (see below), whose sum is σ = 54831168. Its totient is φ = 5026944.

The previous prime is 19216721. The next prime is 19216777. The reversal of 19216740 is 4761291.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 19216698 and 19216707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159 + ... + 6201.

It is an arithmetic number, because the mean of its divisors is an integer number (1142316).

Almost surely, 2^19216740 is an apocalyptic number.

19216740 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 19216740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27415584).

19216740 is an abundant number, since it is smaller than the sum of its proper divisors (35614428).

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

19216740 is a wasteful number, since it uses less digits than its factorization.

19216740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6108 (or 6106 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 19216740 is about 4383.6902262820. The cubic root of 19216740 is about 267.8509790074.

The spelling of 19216740 in words is "nineteen million, two hundred sixteen thousand, seven hundred forty".