19894613040 has 160 divisors (see below), whose sum is σ = 68591889600. Its totient is φ = 5300121600.

The previous prime is 19894613003. The next prime is 19894613047. The reversal of 19894613040 is 4031649891.

It is a super-2 number, since 2×19894613040² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (19894613047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2590326 + ... + 2597994.

It is an arithmetic number, because the mean of its divisors is an integer number (428699310).

Almost surely, 2^19894613040 is an apocalyptic number.

19894613040 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 19894613040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34295944800).

19894613040 is an abundant number, since it is smaller than the sum of its proper divisors (48697276560).

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

19894613040 is a wasteful number, since it uses less digits than its factorization.

19894613040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8892 (or 8880 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 19894613040 in words is "nineteen billion, eight hundred ninety-four million, six hundred thirteen thousand, forty".