1123420555 has 8 divisors (see below), whose sum is σ = 1376788032. Its totient is φ = 879614208.

The previous prime is 1123420549. The next prime is 1123420559. The reversal of 1123420555 is 5550243211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1123420555 - 2⁷ = 1123420427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123420559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2390022 + ... + 2390491.

It is an arithmetic number, because the mean of its divisors is an integer number (172098504).

Almost surely, 2^1123420555 is an apocalyptic number.

1123420555 is a deficient number, since it is larger than the sum of its proper divisors (253367477).

1123420555 is an equidigital number, since it uses as much as digits as its factorization.

1123420555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780565.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1123420555 is about 33517.4664167804. The cubic root of 1123420555 is about 1039.5549609041.

Adding to 1123420555 its reverse (5550243211), we get a palindrome (6673663766).

The spelling of 1123420555 in words is "one billion, one hundred twenty-three million, four hundred twenty thousand, five hundred fifty-five".