1243643452 has 24 divisors (see below), whose sum is σ = 2200794624. Its totient is φ = 614866992.

The previous prime is 1243643413. The next prime is 1243643473. The reversal of 1243643452 is 2543463421.

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, 257403 + ... + 262189.

It is an arithmetic number, because the mean of its divisors is an integer number (91699776).

Almost surely, 2^1243643452 is an apocalyptic number.

It is an amenable number.

1243643452 is a deficient number, since it is larger than the sum of its proper divisors (957151172).

1243643452 is a wasteful number, since it uses less digits than its factorization.

1243643452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5505 (or 5503 counting only the distinct ones).

The product of its digits is 69120, while the sum is 34.

The square root of 1243643452 is about 35265.3293193187. The cubic root of 1243643452 is about 1075.3882720767.

The spelling of 1243643452 in words is "one billion, two hundred forty-three million, six hundred forty-three thousand, four hundred fifty-two".