123311440272 has 20 divisors (see below), whose sum is σ = 318554554160. Its totient is φ = 41103813408.

The previous prime is 123311440271. The next prime is 123311440277. The reversal of 123311440272 is 272044113321.

It is a super-2 number, since 2×123311440272² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123311440271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1284494122 + ... + 1284494217.

It is an arithmetic number, because the mean of its divisors is an integer number (15927727708).

Almost surely, 2^123311440272 is an apocalyptic number.

123311440272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123311440272 is an abundant number, since it is smaller than the sum of its proper divisors (195243113888).

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

123311440272 is a wasteful number, since it uses less digits than its factorization.

123311440272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568988350 (or 2568988344 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

Adding to 123311440272 its reverse (272044113321), we get a palindrome (395355553593).

The spelling of 123311440272 in words is "one hundred twenty-three billion, three hundred eleven million, four hundred forty thousand, two hundred seventy-two".