19497140 has 96 divisors (see below), whose sum is σ = 47416320. Its totient is φ = 6681600.

The previous prime is 19497131. The next prime is 19497143. The reversal of 19497140 is 4179491.

It is a self number, because there is not a number n which added to its sum of digits gives 19497140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19497143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 330431 + ... + 330489.

It is an arithmetic number, because the mean of its divisors is an integer number (493920).

Almost surely, 2^19497140 is an apocalyptic number.

19497140 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 19497140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23708160).

19497140 is an abundant number, since it is smaller than the sum of its proper divisors (27919180).

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

19497140 is a wasteful number, since it uses less digits than its factorization.

19497140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 19497140 is about 4415.5565900575. The cubic root of 19497140 is about 269.1474709968.

The spelling of 19497140 in words is "nineteen million, four hundred ninety-seven thousand, one hundred forty".