1919980 has 24 divisors (see below), whose sum is σ = 4269888. Its totient is φ = 722688.

The previous prime is 1919959. The next prime is 1919987. The reversal of 1919980 is 899191.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1919987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2484 + ... + 3163.

It is an arithmetic number, because the mean of its divisors is an integer number (177912).

2^1919980 is an apocalyptic number.

1919980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1919980 is an abundant number, since it is smaller than the sum of its proper divisors (2349908).

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

1919980 is a wasteful number, since it uses less digits than its factorization.

1919980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5673 (or 5671 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 1919980 is about 1385.6334291579. The cubic root of 1919980 is about 124.2888686766.

The spelling of 1919980 in words is "one million, nine hundred nineteen thousand, nine hundred eighty".