19081940 has 12 divisors (see below), whose sum is σ = 40072116. Its totient is φ = 7632768.

The previous prime is 19081891. The next prime is 19081943. The reversal of 19081940 is 4918091.

It can be written as a sum of positive squares in 2 ways, for example, as 14638276 + 4443664 = 3826^2 + 2108^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19081897 and 19081906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19081943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477029 + ... + 477068.

It is an arithmetic number, because the mean of its divisors is an integer number (3339343).

Almost surely, 2^19081940 is an apocalyptic number.

19081940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19081940 is an abundant number, since it is smaller than the sum of its proper divisors (20990176).

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

19081940 is a wasteful number, since it uses less digits than its factorization.

19081940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954106 (or 954104 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 19081940 is about 4368.2879941689. The cubic root of 19081940 is about 267.2232091963.

The spelling of 19081940 in words is "nineteen million, eighty-one thousand, nine hundred forty".