1229048640 has 140 divisors (see below), whose sum is σ = 4372034436. Its totient is φ = 327739392.

The previous prime is 1229048629. The next prime is 1229048713. The reversal of 1229048640 is 468409221.

1229048640 is a `hidden beast` number, since 1 + 2 + 2 + 9 + 0 + 4 + 8 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 283855104 + 945193536 = 16848^2 + 30744^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1229048595 and 1229048604.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 2212 + ... + 49628.

Almost surely, 2^1229048640 is an apocalyptic number.

1229048640 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 1229048640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2186017218).

1229048640 is an abundant number, since it is smaller than the sum of its proper divisors (3142985796).

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

1229048640 is an equidigital number, since it uses as much as digits as its factorization.

1229048640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47446 (or 47427 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1229048640 is about 35057.7900045054. The cubic root of 1229048640 is about 1071.1649582319.

The spelling of 1229048640 in words is "one billion, two hundred twenty-nine million, forty-eight thousand, six hundred forty".