1938638550920 has 32 divisors (see below), whose sum is σ = 4362271830720. Its totient is φ = 775395848640.

The previous prime is 1938638550913. The next prime is 1938638550931. The reversal of 1938638550920 is 290558368391.

It is a super-2 number, since 2×1938638550920² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1938638550920.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1332566 + ... + 2377605.

It is an arithmetic number, because the mean of its divisors is an integer number (136320994710).

Almost surely, 2^{1938638550920} is an apocalyptic number.

1938638550920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1938638550920 is an abundant number, since it is smaller than the sum of its proper divisors (2423633279800).

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

1938638550920 is a wasteful number, since it uses less digits than its factorization.

1938638550920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3723245 (or 3723241 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 59.

The spelling of 1938638550920 in words is "one trillion, nine hundred thirty-eight billion, six hundred thirty-eight million, five hundred fifty thousand, nine hundred twenty".