123121340 has 12 divisors (see below), whose sum is σ = 258554856. Its totient is φ = 49248528.

The previous prime is 123121337. The next prime is 123121343. The reversal of 123121340 is 43121321.

It is an interprime number because it is at equal distance from previous prime (123121337) and next prime (123121343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3078014 + ... + 3078053.

It is an arithmetic number, because the mean of its divisors is an integer number (21546238).

Almost surely, 2^123121340 is an apocalyptic number.

123121340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123121340 is an abundant number, since it is smaller than the sum of its proper divisors (135433516).

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

123121340 is a wasteful number, since it uses less digits than its factorization.

123121340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6156076 (or 6156074 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 123121340 is about 11096.0055875977. The cubic root of 123121340 is about 497.4824653130.

Adding to 123121340 its reverse (43121321), we get a palindrome (166242661).

The spelling of 123121340 in words is "one hundred twenty-three million, one hundred twenty-one thousand, three hundred forty".