1381508835840 has 800 divisors, whose sum is σ = 5952754177920. Its totient is φ = 299147821056.

The previous prime is 1381508835781. The next prime is 1381508835853. The reversal of 1381508835840 is 485388051831.

1381508835840 is a `hidden beast` number, since 1 + 3 + 8 + 1 + 50 + 8 + 8 + 3 + 584 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 27553834 + ... + 27603926.

Almost surely, 2^{1381508835840} is an apocalyptic number.

1381508835840 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 1381508835840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2976377088960).

1381508835840 is an abundant number, since it is smaller than the sum of its proper divisors (4571245342080).

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

1381508835840 is an equidigital number, since it uses as much as digits as its factorization.

1381508835840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50154 (or 50129 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 54.

The spelling of 1381508835840 in words is "one trillion, three hundred eighty-one billion, five hundred eight million, eight hundred thirty-five thousand, eight hundred forty".