1897339816944 has 640 divisors, whose sum is σ = 6783325839360. Its totient is φ = 499704422400.

The previous prime is 1897339816807. The next prime is 1897339816949. The reversal of 1897339816944 is 4496189337981.

1897339816944 is a `hidden beast` number, since 1 + 8 + 9 + 73 + 398 + 169 + 4 + 4 = 666.

It is a super-2 number, since 2×1897339816944² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897339816949) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 70843684 + ... + 70870460.

It is an arithmetic number, because the mean of its divisors is an integer number (10598946624).

Almost surely, 2^{1897339816944} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1897339816944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3391662919680).

1897339816944 is an abundant number, since it is smaller than the sum of its proper divisors (4885986022416).

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

1897339816944 is a wasteful number, since it uses less digits than its factorization.

1897339816944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26886 (or 26874 counting only the distinct ones).

The product of its digits is 282175488, while the sum is 72.

The spelling of 1897339816944 in words is "one trillion, eight hundred ninety-seven billion, three hundred thirty-nine million, eight hundred sixteen thousand, nine hundred forty-four".