1919808 has 112 divisors (see below), whose sum is σ = 6217920. Its totient is φ = 576000.

The previous prime is 1919789. The next prime is 1919839. The reversal of 1919808 is 8089191.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18958 + ... + 19058.

2^1919808 is an apocalyptic number.

1919808 is a gapful number since it is divisible by the number (18) 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 1919808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3108960).

1919808 is an abundant number, since it is smaller than the sum of its proper divisors (4298112).

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

1919808 is a wasteful number, since it uses less digits than its factorization.

1919808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1919808 is about 1385.5713622907. The cubic root of 1919808 is about 124.2851571234.

It can be divided in two parts, 191 and 9808, that added together give a palindrome (9999).

The spelling of 1919808 in words is "one million, nine hundred nineteen thousand, eight hundred eight".