1897800697044 has 144 divisors (see below), whose sum is σ = 5690662921216. Its totient is φ = 521838028800.

The previous prime is 1897800697043. The next prime is 1897800697109. The reversal of 1897800697044 is 4407960087981.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897800697043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 742884 + ... + 2085060.

Almost surely, 2^{1897800697044} is an apocalyptic number.

1897800697044 is a gapful number since it is divisible by the number (14) 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 1897800697044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2845331460608).

1897800697044 is an abundant number, since it is smaller than the sum of its proper divisors (3792862224172).

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

1897800697044 is a wasteful number, since it uses less digits than its factorization.

1897800697044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342406 (or 1342401 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 1897800697044 in words is "one trillion, eight hundred ninety-seven billion, eight hundred million, six hundred ninety-seven thousand, forty-four".