1226638120 has 16 divisors (see below), whose sum is σ = 2759935860. Its totient is φ = 490655232.

The previous prime is 1226638109. The next prime is 1226638121. The reversal of 1226638120 is 218366221.

It can be written as a sum of positive squares in 2 ways, for example, as 1224020196 + 2617924 = 34986^2 + 1618^2 .

It is not an unprimeable number, because it can be changed into a prime (1226638121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15332937 + ... + 15333016.

Almost surely, 2^1226638120 is an apocalyptic number.

1226638120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1226638120 is an abundant number, since it is smaller than the sum of its proper divisors (1533297740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1226638120 is a wasteful number, since it uses less digits than its factorization.

1226638120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30665964 (or 30665960 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1226638120 is about 35023.3938960804. The cubic root of 1226638120 is about 1070.4642117707.

The spelling of 1226638120 in words is "one billion, two hundred twenty-six million, six hundred thirty-eight thousand, one hundred twenty".