19001328940 has 24 divisors (see below), whose sum is σ = 43530317712. Its totient is φ = 6909574080.

The previous prime is 19001328923. The next prime is 19001328949. The reversal of 19001328940 is 4982310091.

It is a super-2 number, since 2×19001328940² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19001328940.

It is not an unprimeable number, because it can be changed into a prime (19001328949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43184619 + ... + 43185058.

It is an arithmetic number, because the mean of its divisors is an integer number (1813763238).

Almost surely, 2^19001328940 is an apocalyptic number.

19001328940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19001328940 is an abundant number, since it is smaller than the sum of its proper divisors (24528988772).

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

19001328940 is a wasteful number, since it uses less digits than its factorization.

19001328940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86369697 (or 86369695 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 19001328940 in words is "nineteen billion, one million, three hundred twenty-eight thousand, nine hundred forty".