1919172 has 12 divisors (see below), whose sum is σ = 4478096. Its totient is φ = 639720.

The previous prime is 1919161. The next prime is 1919231. The reversal of 1919172 is 2719191.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79954 + ... + 79977.

2^1919172 is an apocalyptic number.

1919172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1919172 is an abundant number, since it is smaller than the sum of its proper divisors (2558924).

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

1919172 is a wasteful number, since it uses less digits than its factorization.

1919172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159938 (or 159936 counting only the distinct ones).

The product of its digits is 1134, while the sum is 30.

The square root of 1919172 is about 1385.3418350718. The cubic root of 1919172 is about 124.2714310823.

It can be divided in two parts, 19 and 19172, that added together give a palindrome (19191).

The spelling of 1919172 in words is "one million, nine hundred nineteen thousand, one hundred seventy-two".