19400000 has 84 divisors (see below), whose sum is σ = 48614076. Its totient is φ = 7680000.

The previous prime is 19399999. The next prime is 19400023. The reversal of 19400000 is 491.

It can be written as a sum of positive squares in 6 ways, for example, as 16386304 + 3013696 = 4048^2 + 1736^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199952 + ... + 200048.

It is an arithmetic number, because the mean of its divisors is an integer number (578739).

Almost surely, 2^19400000 is an apocalyptic number.

19400000 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 19400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24307038).

19400000 is an abundant number, since it is smaller than the sum of its proper divisors (29214076).

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

19400000 is an frugal number, since it uses more digits than its factorization.

19400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 19400000 is about 4404.5431091090. The cubic root of 19400000 is about 268.6997382119.

Adding to 19400000 its reverse (491), we get a palindrome (19400491).

The spelling of 19400000 in words is "nineteen million, four hundred thousand".