1798987357440 has 1728 divisors, whose sum is σ = 7976232456192. Its totient is φ = 364157337600.

The previous prime is 1798987357429. The next prime is 1798987357457. The reversal of 1798987357440 is 447537898971.

1798987357440 is a `hidden beast` number, since 1 + 7 + 9 + 8 + 9 + 8 + 7 + 3 + 574 + 40 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6402090100 + ... + 6402090380.

It is an arithmetic number, because the mean of its divisors is an integer number (4615875264).

Almost surely, 2^{1798987357440} is an apocalyptic number.

1798987357440 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 1798987357440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3988116228096).

1798987357440 is an abundant number, since it is smaller than the sum of its proper divisors (6177245098752).

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

1798987357440 is a wasteful number, since it uses less digits than its factorization.

1798987357440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 426746880, while the sum is 72.

The spelling of 1798987357440 in words is "one trillion, seven hundred ninety-eight billion, nine hundred eighty-seven million, three hundred fifty-seven thousand, four hundred forty".