1243123340 has 12 divisors (see below), whose sum is σ = 2610559056. Its totient is φ = 497249328.

The previous prime is 1243123339. The next prime is 1243123361. The reversal of 1243123340 is 433213421.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31078064 + ... + 31078103.

It is an arithmetic number, because the mean of its divisors is an integer number (217546588).

Almost surely, 2^1243123340 is an apocalyptic number.

1243123340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243123340 is an abundant number, since it is smaller than the sum of its proper divisors (1367435716).

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

1243123340 is a wasteful number, since it uses less digits than its factorization.

1243123340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62156176 (or 62156174 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 1243123340 is about 35257.9542798501. The cubic root of 1243123340 is about 1075.2383361942.

Adding to 1243123340 its reverse (433213421), we get a palindrome (1676336761).

The spelling of 1243123340 in words is "one billion, two hundred forty-three million, one hundred twenty-three thousand, three hundred forty".