19485840 has 160 divisors (see below), whose sum is σ = 67531392. Its totient is φ = 4646400.

The previous prime is 19485799. The next prime is 19485841. The reversal of 19485840 is 4858491.

It is a nialpdrome in base 11.

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (19485841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 319410 + ... + 319470.

Almost surely, 2^19485840 is an apocalyptic number.

19485840 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 19485840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33765696).

19485840 is an abundant number, since it is smaller than the sum of its proper divisors (48045552).

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

19485840 is a wasteful number, since it uses less digits than its factorization.

19485840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 19485840 is about 4414.2768377165. The cubic root of 19485840 is about 269.0954641525.

The spelling of 19485840 in words is "nineteen million, four hundred eighty-five thousand, eight hundred forty".