1938489475428 has 576 divisors, whose sum is σ = 5830484115456. Its totient is φ = 537497856000.

The previous prime is 1938489475423. The next prime is 1938489475547. The reversal of 1938489475428 is 8245749848391.

It is a happy number.

1938489475428 is a `hidden beast` number, since 1 + 9 + 3 + 8 + 48 + 94 + 75 + 428 = 666.

It is not an unprimeable number, because it can be changed into a prime (1938489475423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2004642201 + ... + 2004643167.

It is an arithmetic number, because the mean of its divisors is an integer number (10122368256).

Almost surely, 2^{1938489475428} is an apocalyptic number.

1938489475428 is a gapful number since it is divisible by the number (18) 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 1938489475428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2915242057728).

1938489475428 is an abundant number, since it is smaller than the sum of its proper divisors (3891994640028).

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

1938489475428 is a wasteful number, since it uses less digits than its factorization.

1938489475428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184 (or 1179 counting only the distinct ones).

The product of its digits is 557383680, while the sum is 72.

The spelling of 1938489475428 in words is "one trillion, nine hundred thirty-eight billion, four hundred eighty-nine million, four hundred seventy-five thousand, four hundred twenty-eight".