19042816 has 40 divisors (see below), whose sum is σ = 40989564. Its totient is φ = 8785920.

The previous prime is 19042813. The next prime is 19042817. The reversal of 19042816 is 61824091.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18524416 + 518400 = 4304^2 + 720^2 .

It is not an unprimeable number, because it can be changed into a prime (19042811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5226 + ... + 8086.

Almost surely, 2^19042816 is an apocalyptic number.

19042816 is a gapful number since it is divisible by the number (16) 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 19042816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20494782).

19042816 is an abundant number, since it is smaller than the sum of its proper divisors (21946748).

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

19042816 is an equidigital number, since it uses as much as digits as its factorization.

19042816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892 (or 2876 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 19042816 is about 4363.8075117952. The cubic root of 19042816 is about 267.0404535955.

The spelling of 19042816 in words is "nineteen million, forty-two thousand, eight hundred sixteen".