636694 has 4 divisors (see below), whose sum is σ = 955044. Its totient is φ = 318346.

The previous prime is 636673. The next prime is 636697. The reversal of 636694 is 496636.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159172 + ... + 159175.

It is an arithmetic number, because the mean of its divisors is an integer number (238761).

2⁶³⁶⁶⁹⁴ is an apocalyptic number.

636694 is a deficient number, since it is larger than the sum of its proper divisors (318350).

636694 is a wasteful number, since it uses less digits than its factorization.

636694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318349.

The product of its digits is 23328, while the sum is 34.

The square root of 636694 is about 797.9310747176. The cubic root of 636694 is about 86.0287446729.

The spelling of 636694 in words is "six hundred thirty-six thousand, six hundred ninety-four".