1938688894042 has 4 divisors (see below), whose sum is σ = 2908033341066. Its totient is φ = 969344447020.

The previous prime is 1938688894007. The next prime is 1938688894073. The reversal of 1938688894042 is 2404988868391.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1916123146081 + 22565747961 = 1384241^2 + 150219^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 484672223509 + ... + 484672223512.

Almost surely, 2^{1938688894042} is an apocalyptic number.

1938688894042 is a deficient number, since it is larger than the sum of its proper divisors (969344447024).

1938688894042 is an equidigital number, since it uses as much as digits as its factorization.

1938688894042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969344447023.

The product of its (nonzero) digits is 191102976, while the sum is 70.

The spelling of 1938688894042 in words is "one trillion, nine hundred thirty-eight billion, six hundred eighty-eight million, eight hundred ninety-four thousand, forty-two".