1123729408 has 60 divisors (see below), whose sum is σ = 2271932712. Its totient is φ = 555745280.

The previous prime is 1123729403. The next prime is 1123729433. The reversal of 1123729408 is 8049273211.

It is not an unprimeable number, because it can be changed into a prime (1123729403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1752768 + ... + 1753408.

Almost surely, 2^1123729408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1123729408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1135966356).

1123729408 is an abundant number, since it is smaller than the sum of its proper divisors (1148203304).

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

1123729408 is an frugal number, since it uses more digits than its factorization.

1123729408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1123729408 is about 33522.0734442248. The cubic root of 1123729408 is about 1039.6502176769.

The spelling of 1123729408 in words is "one billion, one hundred twenty-three million, seven hundred twenty-nine thousand, four hundred eight".