636427 has 8 divisors (see below), whose sum is σ = 709632. Its totient is φ = 565800.

The previous prime is 636421. The next prime is 636469. The reversal of 636427 is 724636.

636427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 636427 - 2¹⁹ = 112139 is a prime.

It is a super-3 number, since 3×636427³ = 773333890012759449, which contains 333 as substring.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 636395 and 636404.

It is not an unprimeable number, because it can be changed into a prime (636421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99 + ... + 1132.

It is an arithmetic number, because the mean of its divisors is an integer number (88704).

2⁶³⁶⁴²⁷ is an apocalyptic number.

636427 is a deficient number, since it is larger than the sum of its proper divisors (73205).

636427 is a wasteful number, since it uses less digits than its factorization.

636427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289.

The product of its digits is 6048, while the sum is 28.

The square root of 636427 is about 797.7637494898. The cubic root of 636427 is about 86.0167175000.

Subtracting 636427 from its reverse (724636), we obtain a square (88209 = 297²).

The spelling of 636427 in words is "six hundred thirty-six thousand, four hundred twenty-seven".