19099872 has 72 divisors (see below), whose sum is σ = 59262840. Its totient is φ = 5786880.

The previous prime is 19099853. The next prime is 19099879. The reversal of 19099872 is 27899091.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×19099872² = 729610220832768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19099879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154 + ... + 6182.

It is an arithmetic number, because the mean of its divisors is an integer number (823095).

Almost surely, 2^19099872 is an apocalyptic number.

19099872 is a gapful number since it is divisible by the number (12) 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 19099872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29631420).

19099872 is an abundant number, since it is smaller than the sum of its proper divisors (40162968).

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

19099872 is a wasteful number, since it uses less digits than its factorization.

19099872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6056 (or 6045 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 19099872 is about 4370.3400325375. The cubic root of 19099872 is about 267.3068894780.

It can be divided in two parts, 1909 and 9872, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 19099872 in words is "nineteen million, ninety-nine thousand, eight hundred seventy-two".