1920947189 has 16 divisors (see below), whose sum is σ = 2308331520. Its totient is φ = 1562898480.

The previous prime is 1920947183. The next prime is 1920947201. The reversal of 1920947189 is 9817490291.

It is a cyclic number.

It is not a de Polignac number, because 1920947189 - 2⁸ = 1920946933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920947183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24449 + ... + 66630.

It is an arithmetic number, because the mean of its divisors is an integer number (144270720).

Almost surely, 2^1920947189 is an apocalyptic number.

It is an amenable number.

1920947189 is a deficient number, since it is larger than the sum of its proper divisors (387384331).

1920947189 is a wasteful number, since it uses less digits than its factorization.

1920947189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91240.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 1920947189 is about 43828.6115340196. The cubic root of 1920947189 is about 1243.0973532570.

The spelling of 1920947189 in words is "one billion, nine hundred twenty million, nine hundred forty-seven thousand, one hundred eighty-nine".