1920222397 has 2 divisors, whose sum is σ = 1920222398. Its totient is φ = 1920222396.

The previous prime is 1920222391. The next prime is 1920222433. The reversal of 1920222397 is 7932220291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1910913796 + 9308601 = 43714^2 + 3051^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920222397 - 2¹¹ = 1920220349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920222391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960111198 + 960111199.

It is an arithmetic number, because the mean of its divisors is an integer number (960111199).

Almost surely, 2^1920222397 is an apocalyptic number.

It is an amenable number.

1920222397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920222397 is an equidigital number, since it uses as much as digits as its factorization.

1920222397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 1920222397 is about 43820.3422738801. The cubic root of 1920222397 is about 1242.9409893613.

The spelling of 1920222397 in words is "one billion, nine hundred twenty million, two hundred twenty-two thousand, three hundred ninety-seven".