634923907 has 2 divisors, whose sum is σ = 634923908. Its totient is φ = 634923906.

The previous prime is 634923881. The next prime is 634923977. The reversal of 634923907 is 709329436.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 634923907 - 2¹⁵ = 634891139 is a prime.

It is not a weakly prime, because it can be changed into another prime (634923977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317461953 + 317461954.

It is an arithmetic number, because the mean of its divisors is an integer number (317461954).

Almost surely, 2^634923907 is an apocalyptic number.

634923907 is a deficient number, since it is larger than the sum of its proper divisors (1).

634923907 is an equidigital number, since it uses as much as digits as its factorization.

634923907 is an evil number, because the sum of its binary digits is even.

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

The square root of 634923907 is about 25197.6964621769. The cubic root of 634923907 is about 859.4894693879.

The spelling of 634923907 in words is "six hundred thirty-four million, nine hundred twenty-three thousand, nine hundred seven".