1243650643 has 8 divisors (see below), whose sum is σ = 1313770320. Its totient is φ = 1173997440.

The previous prime is 1243650613. The next prime is 1243650679. The reversal of 1243650643 is 3460563421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1243650643 - 2⁹ = 1243650131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1243650599 and 1243650608.

It is not an unprimeable number, because it can be changed into a prime (1243650613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111130 + ... + 121807.

It is an arithmetic number, because the mean of its divisors is an integer number (164221290).

Almost surely, 2^1243650643 is an apocalyptic number.

1243650643 is a deficient number, since it is larger than the sum of its proper divisors (70119677).

1243650643 is a wasteful number, since it uses less digits than its factorization.

1243650643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233237.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 1243650643 is about 35265.4312748334. The cubic root of 1243650643 is about 1075.3903447775.

The spelling of 1243650643 in words is "one billion, two hundred forty-three million, six hundred fifty thousand, six hundred forty-three".