19819450 has 48 divisors (see below), whose sum is σ = 44622144. Its totient is φ = 6393600.

The previous prime is 19819421. The next prime is 19819453. The reversal of 19819450 is 5491891.

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

It is not an unprimeable number, because it can be changed into a prime (19819453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4285 + ... + 7615.

It is an arithmetic number, because the mean of its divisors is an integer number (929628).

Almost surely, 2^19819450 is an apocalyptic number.

19819450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19819450 is the 2380-th nonagonal number.

19819450 is an abundant number, since it is smaller than the sum of its proper divisors (24802694).

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

19819450 is a wasteful number, since it uses less digits than its factorization.

19819450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367 (or 3362 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 19819450 is about 4451.9040870171. The cubic root of 19819450 is about 270.6224778285.

The spelling of 19819450 in words is "nineteen million, eight hundred nineteen thousand, four hundred fifty".