19397880 has 80 divisors (see below), whose sum is σ = 65209320. Its totient is φ = 5171904.

The previous prime is 19397857. The next prime is 19397881. The reversal of 19397880 is 8879391.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19397881) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 247 + ... + 6233.

Almost surely, 2^19397880 is an apocalyptic number.

19397880 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 19397880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32604660).

19397880 is an abundant number, since it is smaller than the sum of its proper divisors (45811440).

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

19397880 is a wasteful number, since it uses less digits than its factorization.

19397880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6010 (or 5997 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 19397880 is about 4404.3024419311. The cubic root of 19397880 is about 268.6899501673.

The spelling of 19397880 in words is "nineteen million, three hundred ninety-seven thousand, eight hundred eighty".