19919406 has 32 divisors (see below), whose sum is σ = 43908480. Its totient is φ = 5985504.

The previous prime is 19919401. The next prime is 19919413. The reversal of 19919406 is 60491991.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19919401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (1372140).

Almost surely, 2^19919406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19919406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21954240).

19919406 is an abundant number, since it is smaller than the sum of its proper divisors (23989074).

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

19919406 is a wasteful number, since it uses less digits than its factorization.

19919406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 19919406 is about 4463.1161759470. The cubic root of 19919406 is about 271.0766611820.

The spelling of 19919406 in words is "nineteen million, nine hundred nineteen thousand, four hundred six".