19845456 has 40 divisors (see below), whose sum is σ = 52925184. Its totient is φ = 6401280.

The previous prime is 19845451. The next prime is 19845457. The reversal of 19845456 is 65454891.

19845456 is a modest number, since divided by 5456 gives 1984 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19845451) 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 7 ways as a sum of consecutive naturals, for example, 5181 + ... + 8156.

Almost surely, 2^19845456 is an apocalyptic number.

19845456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19845456 is an abundant number, since it is smaller than the sum of its proper divisors (33079728).

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

19845456 is a wasteful number, since it uses less digits than its factorization.

19845456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13379 (or 13373 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 19845456 is about 4454.8239022435. The cubic root of 19845456 is about 270.7407914412.

It can be divided in two parts, 19845 and 456, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 19845456 in words is "nineteen million, eight hundred forty-five thousand, four hundred fifty-six".