1213623643 has 8 divisors (see below), whose sum is σ = 1253317520. Its totient is φ = 1174292640.

The previous prime is 1213623623. The next prime is 1213623667. The reversal of 1213623643 is 3463263121.

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 1213623643 - 2⁵ = 1213623611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213623623) 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, 83913 + ... + 97306.

It is an arithmetic number, because the mean of its divisors is an integer number (156664690).

Almost surely, 2^1213623643 is an apocalyptic number.

1213623643 is a deficient number, since it is larger than the sum of its proper divisors (39693877).

1213623643 is a wasteful number, since it uses less digits than its factorization.

1213623643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181437.

The product of its digits is 15552, while the sum is 31.

The square root of 1213623643 is about 34837.1015298345. The cubic root of 1213623643 is about 1066.6649127684.

Adding to 1213623643 its reverse (3463263121), we get a palindrome (4676886764).

The spelling of 1213623643 in words is "one billion, two hundred thirteen million, six hundred twenty-three thousand, six hundred forty-three".