1897921005840 has 480 divisors, whose sum is σ = 6732295105536. Its totient is φ = 478523842560.

The previous prime is 1897921005833. The next prime is 1897921005901. The reversal of 1897921005840 is 485001297981.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 287255817 + ... + 287262423.

Almost surely, 2^{1897921005840} is an apocalyptic number.

1897921005840 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 1897921005840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3366147552768).

1897921005840 is an abundant number, since it is smaller than the sum of its proper divisors (4834374099696).

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

1897921005840 is a wasteful number, since it uses less digits than its factorization.

1897921005840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6967 (or 6958 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 1897921005840 in words is "one trillion, eight hundred ninety-seven billion, nine hundred twenty-one million, five thousand, eight hundred forty".