1229126140 has 96 divisors (see below), whose sum is σ = 2975616000. Its totient is φ = 422257920.

The previous prime is 1229126083. The next prime is 1229126159. The reversal of 1229126140 is 416219221.

It is a junction number, because it is equal to n+sod(n) for n = 1229126099 and 1229126108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297811 + ... + 301909.

It is an arithmetic number, because the mean of its divisors is an integer number (30996000).

Almost surely, 2^1229126140 is an apocalyptic number.

1229126140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1229126140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1487808000).

1229126140 is an abundant number, since it is smaller than the sum of its proper divisors (1746489860).

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

1229126140 is a wasteful number, since it uses less digits than its factorization.

1229126140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4195 (or 4193 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1229126140 is about 35058.8953049009. The cubic root of 1229126140 is about 1071.1874725401.

The spelling of 1229126140 in words is "one billion, two hundred twenty-nine million, one hundred twenty-six thousand, one hundred forty".