634709923 has 2 divisors, whose sum is σ = 634709924. Its totient is φ = 634709922.

The previous prime is 634709899. The next prime is 634709969. The reversal of 634709923 is 329907436.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634709923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 634709923.

It is not a weakly prime, because it can be changed into another prime (634709993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317354961 + 317354962.

It is an arithmetic number, because the mean of its divisors is an integer number (317354962).

Almost surely, 2^634709923 is an apocalyptic number.

634709923 is a deficient number, since it is larger than the sum of its proper divisors (1).

634709923 is an equidigital number, since it uses as much as digits as its factorization.

634709923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 634709923 is about 25193.4500019350. The cubic root of 634709923 is about 859.3929026142.

The spelling of 634709923 in words is "six hundred thirty-four million, seven hundred nine thousand, nine hundred twenty-three".