19012840 has 64 divisors (see below), whose sum is σ = 53343360. Its totient is φ = 5925120.

The previous prime is 19012831. The next prime is 19012871. The reversal of 19012840 is 4821091.

It is a happy number.

It is a super-2 number, since 2×19012840² = 722976169731200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7 + ... + 6166.

It is an arithmetic number, because the mean of its divisors is an integer number (833490).

Almost surely, 2^19012840 is an apocalyptic number.

19012840 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 19012840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26671680).

19012840 is an abundant number, since it is smaller than the sum of its proper divisors (34330520).

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

19012840 is a wasteful number, since it uses less digits than its factorization.

19012840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6202 (or 6198 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 19012840 is about 4360.3715438022. The cubic root of 19012840 is about 266.9002605951.

The spelling of 19012840 in words is "nineteen million, twelve thousand, eight hundred forty".