1920827989 has 2 divisors, whose sum is σ = 1920827990. Its totient is φ = 1920827988.

The previous prime is 1920827897. The next prime is 1920828037. The reversal of 1920827989 is 9897280291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1666680625 + 254147364 = 40825^2 + 15942^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920827989 - 2⁷ = 1920827861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920827089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960413994 + 960413995.

It is an arithmetic number, because the mean of its divisors is an integer number (960413995).

Almost surely, 2^1920827989 is an apocalyptic number.

It is an amenable number.

1920827989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920827989 is an equidigital number, since it uses as much as digits as its factorization.

1920827989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 1920827989 is about 43827.2516706216. The cubic root of 1920827989 is about 1243.0716402007.

The spelling of 1920827989 in words is "one billion, nine hundred twenty million, eight hundred twenty-seven thousand, nine hundred eighty-nine".