19445040 has 120 divisors (see below), whose sum is σ = 66156480. Its totient is φ = 5117952.

The previous prime is 19445033. The next prime is 19445057. The reversal of 19445040 is 4054491.

It is a tau number, because it is divible by the number of its divisors (120).

It is a junction number, because it is equal to n+sod(n) for n = 19444995 and 19445013.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81241 + ... + 81479.

It is an arithmetic number, because the mean of its divisors is an integer number (551304).

Almost surely, 2^19445040 is an apocalyptic number.

19445040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19445040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33078240).

19445040 is an abundant number, since it is smaller than the sum of its proper divisors (46711440).

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

19445040 is a wasteful number, since it uses less digits than its factorization.

19445040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 19445040 is about 4409.6530475764. The cubic root of 19445040 is about 268.9075196991.

The spelling of 19445040 in words is "nineteen million, four hundred forty-five thousand, forty".