636741 has 20 divisors (see below), whose sum is σ = 1088032. Its totient is φ = 363528.

The previous prime is 636739. The next prime is 636749. The reversal of 636741 is 147636.

It is not a de Polignac number, because 636741 - 2¹ = 636739 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636749) 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 in 19 ways as a sum of consecutive naturals, for example, 6 + ... + 1128.

2⁶³⁶⁷⁴¹ is an apocalyptic number.

It is an amenable number.

636741 is a deficient number, since it is larger than the sum of its proper divisors (451291).

636741 is a wasteful number, since it uses less digits than its factorization.

636741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142 (or 1133 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 636741 is about 797.9605253394. The cubic root of 636741 is about 86.0308614676.

The spelling of 636741 in words is "six hundred thirty-six thousand, seven hundred forty-one".