1243308985 has 8 divisors (see below), whose sum is σ = 1570495680. Its totient is φ = 942297264.

The previous prime is 1243308977. The next prime is 1243309003. The reversal of 1243308985 is 5898033421.

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 1243308985 - 2³ = 1243308977 is a prime.

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, 6543637 + ... + 6543826.

It is an arithmetic number, because the mean of its divisors is an integer number (196311960).

Almost surely, 2^1243308985 is an apocalyptic number.

It is an amenable number.

1243308985 is a deficient number, since it is larger than the sum of its proper divisors (327186695).

1243308985 is a wasteful number, since it uses less digits than its factorization.

1243308985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13087487.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 1243308985 is about 35260.5868499093. The cubic root of 1243308985 is about 1075.2918580180.

The spelling of 1243308985 in words is "one billion, two hundred forty-three million, three hundred eight thousand, nine hundred eighty-five".