1920612389 has 4 divisors (see below), whose sum is σ = 1952097900. Its totient is φ = 1889126880.

The previous prime is 1920612361. The next prime is 1920612413. The reversal of 1920612389 is 9832160291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9832160291 = 31 ⋅317166461.

It can be written as a sum of positive squares in 2 ways, for example, as 309232225 + 1611380164 = 17585^2 + 40142^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1920612389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920617389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15742664 + ... + 15742785.

It is an arithmetic number, because the mean of its divisors is an integer number (488024475).

Almost surely, 2^1920612389 is an apocalyptic number.

It is an amenable number.

1920612389 is a deficient number, since it is larger than the sum of its proper divisors (31485511).

1920612389 is an equidigital number, since it uses as much as digits as its factorization.

1920612389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31485510.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 1920612389 is about 43824.7919447429. The cubic root of 1920612389 is about 1243.0251296550.

The spelling of 1920612389 in words is "one billion, nine hundred twenty million, six hundred twelve thousand, three hundred eighty-nine".