1919916 has 48 divisors (see below), whose sum is σ = 5157600. Its totient is φ = 616896.

The previous prime is 1919891. The next prime is 1919917. The reversal of 1919916 is 6199191.

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 not an unprimeable number, because it can be changed into a prime (1919917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2826 + ... + 3438.

It is an arithmetic number, because the mean of its divisors is an integer number (107450).

2^1919916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1919916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2578800).

1919916 is an abundant number, since it is smaller than the sum of its proper divisors (3237684).

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

1919916 is a wasteful number, since it uses less digits than its factorization.

1919916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 647 counting only the distinct ones).

The product of its digits is 4374, while the sum is 36.

The square root of 1919916 is about 1385.6103348344. The cubic root of 1919916 is about 124.2874876594.

Subtracting 1919916 from its reverse (6199191), we obtain a triangular number (4279275 = T₂₉₂₅).

The spelling of 1919916 in words is "one million, nine hundred nineteen thousand, nine hundred sixteen".