648430939 has 4 divisors (see below), whose sum is σ = 698310256. Its totient is φ = 598551624.

The previous prime is 648430933. The next prime is 648430961. The reversal of 648430939 is 939034846.

648430939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 648430939 - 2⁵ = 648430907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648430933) 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, 24939639 + ... + 24939664.

It is an arithmetic number, because the mean of its divisors is an integer number (174577564).

Almost surely, 2^648430939 is an apocalyptic number.

648430939 is a deficient number, since it is larger than the sum of its proper divisors (49879317).

648430939 is a wasteful number, since it uses less digits than its factorization.

648430939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49879316.

The product of its (nonzero) digits is 559872, while the sum is 46.

The square root of 648430939 is about 25464.3071572741. The cubic root of 648430939 is about 865.5415273270.

The spelling of 648430939 in words is "six hundred forty-eight million, four hundred thirty thousand, nine hundred thirty-nine".