634709986 has 4 divisors (see below), whose sum is σ = 952064982. Its totient is φ = 317354992.

The previous prime is 634709969. The next prime is 634709987. The reversal of 634709986 is 689907436.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 379509361 + 255200625 = 19481^2 + 15975^2 .

It is not an unprimeable number, because it can be changed into a prime (634709987) 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, 158677495 + ... + 158677498.

Almost surely, 2^634709986 is an apocalyptic number.

634709986 is a deficient number, since it is larger than the sum of its proper divisors (317354996).

634709986 is a wasteful number, since it uses less digits than its factorization.

634709986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317354995.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The square root of 634709986 is about 25193.4512522600. The cubic root of 634709986 is about 859.3929310480.

The spelling of 634709986 in words is "six hundred thirty-four million, seven hundred nine thousand, nine hundred eighty-six".