19397550 has 48 divisors (see below), whose sum is σ = 48679920. Its totient is φ = 5111040.

The previous prime is 19397513. The next prime is 19397569. The reversal of 19397550 is 5579391.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19397499 and 19397508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12624 + ... + 14076.

It is an arithmetic number, because the mean of its divisors is an integer number (1014165).

Almost surely, 2^19397550 is an apocalyptic number.

19397550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19397550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24339960).

19397550 is an abundant number, since it is smaller than the sum of its proper divisors (29282370).

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

19397550 is a wasteful number, since it uses less digits than its factorization.

19397550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557 (or 1552 counting only the distinct ones).

The product of its (nonzero) digits is 42525, while the sum is 39.

The square root of 19397550 is about 4404.2649784045. The cubic root of 19397550 is about 268.6884264924.

The spelling of 19397550 in words is "nineteen million, three hundred ninety-seven thousand, five hundred fifty".