19490640 has 80 divisors (see below), whose sum is σ = 65079168. Its totient is φ = 4796928.

The previous prime is 19490633. The next prime is 19490651. The reversal of 19490640 is 4609491.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4 + ... + 6243.

Almost surely, 2^19490640 is an apocalyptic number.

19490640 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 19490640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32539584).

19490640 is an abundant number, since it is smaller than the sum of its proper divisors (45588528).

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

19490640 is a wasteful number, since it uses less digits than its factorization.

19490640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6276 (or 6270 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 19490640 is about 4414.8204946521. The cubic root of 19490640 is about 269.1175580111.

The spelling of 19490640 in words is "nineteen million, four hundred ninety thousand, six hundred forty".