923648639 has 2 divisors, whose sum is σ = 923648640. Its totient is φ = 923648638.

The previous prime is 923648623. The next prime is 923648659. The reversal of 923648639 is 936846329.

It is a weak prime.

It is an emirp because it is prime and its reverse (936846329) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 923648639 - 2⁴ = 923648623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (923648659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 461824319 + 461824320.

It is an arithmetic number, because the mean of its divisors is an integer number (461824320).

Almost surely, 2^923648639 is an apocalyptic number.

923648639 is a deficient number, since it is larger than the sum of its proper divisors (1).

923648639 is an equidigital number, since it uses as much as digits as its factorization.

923648639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 50.

The square root of 923648639 is about 30391.5882934736. The cubic root of 923648639 is about 973.8728641363.

It can be divided in two parts, 9236 and 48639, that added together give a palindrome (57875).

The spelling of 923648639 in words is "nine hundred twenty-three million, six hundred forty-eight thousand, six hundred thirty-nine".