1922208649 has 9 divisors (see below), whose sum is σ = 2042723047. Its totient is φ = 1808436064.

The previous prime is 1922208643. The next prime is 1922208689. The reversal of 1922208649 is 9468022291.

It is a happy number.

The square root of 1922208649 is 43843.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1496529225 + 425679424 = 38685^2 + 20632^2 .

It is not a de Polignac number, because 1922208649 - 2³ = 1922208641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1922208641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 744042 + ... + 746620.

Almost surely, 2^1922208649 is an apocalyptic number.

1922208649 is the 43843-rd square number.

1922208649 is the 21922-nd centered octagonal number.

It is an amenable number.

1922208649 is a deficient number, since it is larger than the sum of its proper divisors (120514398).

1922208649 is an frugal number, since it uses more digits than its factorization.

1922208649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5192 (or 2596 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The cubic root of 1922208649 is about 1243.3694021135.

The spelling of 1922208649 in words is "one billion, nine hundred twenty-two million, two hundred eight thousand, six hundred forty-nine".