647238379 has 2 divisors, whose sum is σ = 647238380. Its totient is φ = 647238378.

The previous prime is 647238353. The next prime is 647238407. The reversal of 647238379 is 973832746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647238379 - 2⁹ = 647237867 is a prime.

It is not a weakly prime, because it can be changed into another prime (647238329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323619189 + 323619190.

It is an arithmetic number, because the mean of its divisors is an integer number (323619190).

Almost surely, 2^647238379 is an apocalyptic number.

647238379 is a deficient number, since it is larger than the sum of its proper divisors (1).

647238379 is an equidigital number, since it uses as much as digits as its factorization.

647238379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 49.

The square root of 647238379 is about 25440.8800751861. The cubic root of 647238379 is about 865.0105822488.

The spelling of 647238379 in words is "six hundred forty-seven million, two hundred thirty-eight thousand, three hundred seventy-nine".