636142 has 16 divisors (see below), whose sum is σ = 1053360. Its totient is φ = 286272.

The previous prime is 636137. The next prime is 636149. The reversal of 636142 is 241636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636149) by changing a digit.

636142 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834 + ... + 1402.

It is an arithmetic number, because the mean of its divisors is an integer number (65835).

2⁶³⁶¹⁴² is an apocalyptic number.

636142 is a deficient number, since it is larger than the sum of its proper divisors (417218).

636142 is a wasteful number, since it uses less digits than its factorization.

636142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627.

The product of its digits is 864, while the sum is 22.

The square root of 636142 is about 797.5851051769. The cubic root of 636142 is about 86.0038757943.

Adding to 636142 its reverse (241636), we get a palindrome (877778).

The spelling of 636142 in words is "six hundred thirty-six thousand, one hundred forty-two".