1538539920000 has 2240 divisors, whose sum is σ = 6352668495360. Its totient is φ = 369515520000.

The previous prime is 1538539919951. The next prime is 1538539920007. The reversal of 1538539920000 is 299358351.

1538539920000 is a `hidden beast` number, since 1 + 53 + 8 + 5 + 399 + 200 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538539920007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 279 ways as a sum of consecutive naturals, for example, 41582159982 + ... + 41582160018.

Almost surely, 2^{1538539920000} is an apocalyptic number.

1538539920000 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 1538539920000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3176334247680).

1538539920000 is an abundant number, since it is smaller than the sum of its proper divisors (4814128575360).

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

1538539920000 is an frugal number, since it uses more digits than its factorization.

1538539920000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 1538539920000 in words is "one trillion, five hundred thirty-eight billion, five hundred thirty-nine million, nine hundred twenty thousand".