19748640 has 48 divisors (see below), whose sum is σ = 62209728. Its totient is φ = 5266176.

The previous prime is 19748633. The next prime is 19748647. The reversal of 19748640 is 4684791.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19748633) and next prime (19748647).

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (19748647) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20092 + ... + 21051.

It is an arithmetic number, because the mean of its divisors is an integer number (1296036).

Almost surely, 2^19748640 is an apocalyptic number.

19748640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19748640 is an abundant number, since it is smaller than the sum of its proper divisors (42461088).

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

19748640 is a wasteful number, since it uses less digits than its factorization.

19748640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41161 (or 41153 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 19748640 is about 4443.9441940690. The cubic root of 19748640 is about 270.2998041527.

The spelling of 19748640 in words is "nineteen million, seven hundred forty-eight thousand, six hundred forty".