1222840538 has 4 divisors (see below), whose sum is σ = 1834260810. Its totient is φ = 611420268.

The previous prime is 1222840483. The next prime is 1222840543. The reversal of 1222840538 is 8350482221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1206381289 + 16459249 = 34733^2 + 4057^2 .

It is a super-2 number, since 2×1222840538² = 2990677962752258888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1222840498 and 1222840507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305710133 + ... + 305710136.

Almost surely, 2^1222840538 is an apocalyptic number.

1222840538 is a deficient number, since it is larger than the sum of its proper divisors (611420272).

1222840538 is an equidigital number, since it uses as much as digits as its factorization.

1222840538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611420271.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 1222840538 is about 34969.1369353034. The cubic root of 1222840538 is about 1069.3583767928.

The spelling of 1222840538 in words is "one billion, two hundred twenty-two million, eight hundred forty thousand, five hundred thirty-eight".