1223540985 has 8 divisors (see below), whose sum is σ = 1957665600. Its totient is φ = 652555184.

The previous prime is 1223540957. The next prime is 1223540993. The reversal of 1223540985 is 5890453221.

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 1223540985 - 2⁶ = 1223540921 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, 40784685 + ... + 40784714.

It is an arithmetic number, because the mean of its divisors is an integer number (244708200).

Almost surely, 2^1223540985 is an apocalyptic number.

1223540985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223540985 is a deficient number, since it is larger than the sum of its proper divisors (734124615).

1223540985 is an equidigital number, since it uses as much as digits as its factorization.

1223540985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81569407.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 1223540985 is about 34979.1507186781. The cubic root of 1223540985 is about 1069.5625151286.

The spelling of 1223540985 in words is "one billion, two hundred twenty-three million, five hundred forty thousand, nine hundred eighty-five".