19899488 has 72 divisors (see below), whose sum is σ = 46941552. Its totient is φ = 8297856.

The previous prime is 19899463. The next prime is 19899511. The reversal of 19899488 is 88499891.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 537806 + ... + 537842.

It is an arithmetic number, because the mean of its divisors is an integer number (651966).

Almost surely, 2^19899488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19899488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23470776).

19899488 is an abundant number, since it is smaller than the sum of its proper divisors (27042064).

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

19899488 is an frugal number, since it uses more digits than its factorization.

19899488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 46 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 56.

The square root of 19899488 is about 4460.8842172825. The cubic root of 19899488 is about 270.9862785407.

The spelling of 19899488 in words is "nineteen million, eight hundred ninety-nine thousand, four hundred eighty-eight".