1243641340 has 24 divisors (see below), whose sum is σ = 2630441520. Its totient is φ = 493876608.

The previous prime is 1243641323. The next prime is 1243641367. The reversal of 1243641340 is 431463421.

It is a junction number, because it is equal to n+sod(n) for n = 1243641299 and 1243641308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220897 + ... + 226456.

It is an arithmetic number, because the mean of its divisors is an integer number (109601730).

Almost surely, 2^1243641340 is an apocalyptic number.

1243641340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243641340 is an abundant number, since it is smaller than the sum of its proper divisors (1386800180).

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

1243641340 is a wasteful number, since it uses less digits than its factorization.

1243641340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447501 (or 447499 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 1243641340 is about 35265.2993748813. The cubic root of 1243641340 is about 1075.3876633220.

The spelling of 1243641340 in words is "one billion, two hundred forty-three million, six hundred forty-one thousand, three hundred forty".