1243429985 has 8 divisors (see below), whose sum is σ = 1705275456. Its totient is φ = 852637680.

The previous prime is 1243429961. The next prime is 1243430003. The reversal of 1243429985 is 5899243421.

It is a happy number.

1243429985 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1243429985 - 2¹⁶ = 1243364449 is a prime.

It is a super-2 number, since 2×1243429985² = 3092236255194200450, which contains 22 as substring.

It is a Duffinian 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, 17763251 + ... + 17763320.

It is an arithmetic number, because the mean of its divisors is an integer number (213159432).

Almost surely, 2^1243429985 is an apocalyptic number.

It is an amenable number.

1243429985 is a deficient number, since it is larger than the sum of its proper divisors (461845471).

1243429985 is an equidigital number, since it uses as much as digits as its factorization.

1243429985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35526583.

The product of its digits is 622080, while the sum is 47.

The square root of 1243429985 is about 35262.3026049066. The cubic root of 1243429985 is about 1075.3267396915.

The spelling of 1243429985 in words is "one billion, two hundred forty-three million, four hundred twenty-nine thousand, nine hundred eighty-five".