1927988021074 has 4 divisors (see below), whose sum is σ = 2891982031614. Its totient is φ = 963994010536.

The previous prime is 1927988021023. The next prime is 1927988021077. The reversal of 1927988021074 is 4701208897291.

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., 1735034280849 + 192953740225 = 1317207^2 + 439265^2 .

It is a super-2 number, since 2×1927988021074² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1927988021077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 481997005267 + ... + 481997005270.

Almost surely, 2^{1927988021074} is an apocalyptic number.

1927988021074 is a deficient number, since it is larger than the sum of its proper divisors (963994010540).

1927988021074 is an equidigital number, since it uses as much as digits as its factorization.

1927988021074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963994010539.

The product of its (nonzero) digits is 4064256, while the sum is 58.

The spelling of 1927988021074 in words is "one trillion, nine hundred twenty-seven billion, nine hundred eighty-eight million, twenty-one thousand, seventy-four".