1938688894040 has 64 divisors (see below), whose sum is σ = 4552225954560. Its totient is φ = 741674229120.

The previous prime is 1938688894007. The next prime is 1938688894073. The reversal of 1938688894040 is 404988868391.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1938688894007) and next prime (1938688894073).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8225435 + ... + 8457845.

It is an arithmetic number, because the mean of its divisors is an integer number (71128530540).

Almost surely, 2^{1938688894040} is an apocalyptic number.

1938688894040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1938688894040 is an abundant number, since it is smaller than the sum of its proper divisors (2613537060520).

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

1938688894040 is a wasteful number, since it uses less digits than its factorization.

1938688894040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241512 (or 241508 counting only the distinct ones).

The product of its (nonzero) digits is 95551488, while the sum is 68.

The spelling of 1938688894040 in words is "one trillion, nine hundred thirty-eight billion, six hundred eighty-eight million, eight hundred ninety-four thousand, forty".