1223180640 has 576 divisors, whose sum is σ = 4891041792. Its totient is φ = 275558400.

The previous prime is 1223180639. The next prime is 1223180659. The reversal of 1223180640 is 460813221.

1223180640 is a `hidden beast` number, since 1 + 2 + 2 + 3 + 18 + 0 + 640 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 23078854 + ... + 23078906.

It is an arithmetic number, because the mean of its divisors is an integer number (8491392).

Almost surely, 2^1223180640 is an apocalyptic number.

1223180640 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 1223180640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2445520896).

1223180640 is an abundant number, since it is smaller than the sum of its proper divisors (3667861152).

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

1223180640 is a wasteful number, since it uses less digits than its factorization.

1223180640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1223180640 is about 34973.9994853320. Note that the first 3 decimals coincide. The cubic root of 1223180640 is about 1069.4575058832.

Adding to 1223180640 its reverse (460813221), we get a palindrome (1683993861).

The spelling of 1223180640 in words is "one billion, two hundred twenty-three million, one hundred eighty thousand, six hundred forty".