1229686643 has 8 divisors (see below), whose sum is σ = 1238998080. Its totient is φ = 1220394240.

The previous prime is 1229686639. The next prime is 1229686657. The reversal of 1229686643 is 3466869221.

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 1229686643 - 2² = 1229686639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1229686663) 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, 141638 + ... + 150068.

It is an arithmetic number, because the mean of its divisors is an integer number (154874760).

Almost surely, 2^1229686643 is an apocalyptic number.

1229686643 is a deficient number, since it is larger than the sum of its proper divisors (9311437).

1229686643 is an equidigital number, since it uses as much as digits as its factorization.

1229686643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9517.

The product of its digits is 746496, while the sum is 47.

The square root of 1229686643 is about 35066.8881282614. Note that the first 3 decimals coincide. The cubic root of 1229686643 is about 1071.3502745316.

The spelling of 1229686643 in words is "one billion, two hundred twenty-nine million, six hundred eighty-six thousand, six hundred forty-three".