19012640 has 48 divisors (see below), whose sum is σ = 45178560. Its totient is φ = 7560960.

The previous prime is 19012639. The next prime is 19012649. The reversal of 19012640 is 4621091.

It is a happy number.

It is a super-2 number, since 2×19012640² = 722960959539200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19012649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52781 + ... + 53139.

It is an arithmetic number, because the mean of its divisors is an integer number (941220).

Almost surely, 2^19012640 is an apocalyptic number.

19012640 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 19012640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22589280).

19012640 is an abundant number, since it is smaller than the sum of its proper divisors (26165920).

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

19012640 is a wasteful number, since it uses less digits than its factorization.

19012640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705 (or 697 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 19012640 is about 4360.3486099164. The cubic root of 19012640 is about 266.8993247321.

The spelling of 19012640 in words is "nineteen million, twelve thousand, six hundred forty".