1243604623 has 4 divisors (see below), whose sum is σ = 1245017088. Its totient is φ = 1242192160.

The previous prime is 1243604599. The next prime is 1243604627. The reversal of 1243604623 is 3264063421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1243604623 - 2²¹ = 1241507471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243604627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704911 + ... + 706672.

It is an arithmetic number, because the mean of its divisors is an integer number (311254272).

Almost surely, 2^1243604623 is an apocalyptic number.

1243604623 is a deficient number, since it is larger than the sum of its proper divisors (1412465).

1243604623 is an equidigital number, since it uses as much as digits as its factorization.

1243604623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412464.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 1243604623 is about 35264.7787884739. The cubic root of 1243604623 is about 1075.3770800464.

The spelling of 1243604623 in words is "one billion, two hundred forty-three million, six hundred four thousand, six hundred twenty-three".