1123555590 has 64 divisors (see below), whose sum is σ = 3011973120. Its totient is φ = 298032480.

The previous prime is 1123555583. The next prime is 1123555597. The reversal of 1123555590 is 955553211.

1123555590 is a `hidden beast` number, since 1 + 12 + 3 + 5 + 55 + 590 = 666.

It is an interprime number because it is at equal distance from previous prime (1123555583) and next prime (1123555597).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123555597) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40677 + ... + 62463.

It is an arithmetic number, because the mean of its divisors is an integer number (47062080).

Almost surely, 2^1123555590 is an apocalyptic number.

1123555590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1123555590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1505986560).

1123555590 is an abundant number, since it is smaller than the sum of its proper divisors (1888417530).

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

1123555590 is a wasteful number, since it uses less digits than its factorization.

1123555590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21994 (or 21988 counting only the distinct ones).

The product of its (nonzero) digits is 33750, while the sum is 36.

The square root of 1123555590 is about 33519.4807537348. The cubic root of 1123555590 is about 1039.5966106910.

The spelling of 1123555590 in words is "one billion, one hundred twenty-three million, five hundred fifty-five thousand, five hundred ninety".