1212240555 has 24 divisors (see below), whose sum is σ = 2130006528. Its totient is φ = 637670016.

The previous prime is 1212240541. The next prime is 1212240559. The reversal of 1212240555 is 5550422121.

It is a de Polignac number, because none of the positive numbers 2^k-1212240555 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212240559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181227 + ... + 187796.

It is an arithmetic number, because the mean of its divisors is an integer number (88750272).

Almost surely, 2^1212240555 is an apocalyptic number.

1212240555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1212240555 is a deficient number, since it is larger than the sum of its proper divisors (917765973).

1212240555 is a wasteful number, since it uses less digits than its factorization.

1212240555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369107 (or 369104 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1212240555 is about 34817.2450805632. The cubic root of 1212240555 is about 1066.2595558480.

Adding to 1212240555 its reverse (5550422121), we get a palindrome (6762662676).

The spelling of 1212240555 in words is "one billion, two hundred twelve million, two hundred forty thousand, five hundred fifty-five".