19472640 has 144 divisors (see below), whose sum is σ = 67991616. Its totient is φ = 4710400.

The previous prime is 19472627. The next prime is 19472647. The reversal of 19472640 is 4627491.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (19472647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42010 + ... + 42470.

It is an arithmetic number, because the mean of its divisors is an integer number (472164).

Almost surely, 2^19472640 is an apocalyptic number.

19472640 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 19472640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33995808).

19472640 is an abundant number, since it is smaller than the sum of its proper divisors (48518976).

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

19472640 is a wasteful number, since it uses less digits than its factorization.

19472640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 482 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 19472640 is about 4412.7814357840. The cubic root of 19472640 is about 269.0346873268.

The spelling of 19472640 in words is "nineteen million, four hundred seventy-two thousand, six hundred forty".