19416816 has 30 divisors (see below), whose sum is σ = 54340520. Its totient is φ = 6472224.

The previous prime is 19416799. The next prime is 19416827. The reversal of 19416816 is 61861491.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67276 + ... + 67563.

Almost surely, 2^19416816 is an apocalyptic number.

19416816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19416816 is an abundant number, since it is smaller than the sum of its proper divisors (34923704).

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

19416816 is a wasteful number, since it uses less digits than its factorization.

19416816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134853 (or 134844 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 19416816 is about 4406.4516336844. The cubic root of 19416816 is about 268.7773524712. Note that the first 3 decimals are identical.

The spelling of 19416816 in words is "nineteen million, four hundred sixteen thousand, eight hundred sixteen".