1938571989 has 8 divisors (see below), whose sum is σ = 2585059680. Its totient is φ = 1292232816.

The previous prime is 1938571907. The next prime is 1938571991. The reversal of 1938571989 is 9891758391.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1938571989 - 2⁷ = 1938571861 is a prime.

It is a super-2 number, since 2×1938571989² = 7516122713070832242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938571189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1894 + ... + 62295.

It is an arithmetic number, because the mean of its divisors is an integer number (323132460).

Almost surely, 2^1938571989 is an apocalyptic number.

It is an amenable number.

1938571989 is a deficient number, since it is larger than the sum of its proper divisors (646487691).

1938571989 is a wasteful number, since it uses less digits than its factorization.

1938571989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74259.

The product of its digits is 4898880, while the sum is 60.

The square root of 1938571989 is about 44029.2174470544. The cubic root of 1938571989 is about 1246.8876145306.

The spelling of 1938571989 in words is "one billion, nine hundred thirty-eight million, five hundred seventy-one thousand, nine hundred eighty-nine".