133642 has 4 divisors (see below), whose sum is σ = 200466. Its totient is φ = 66820.

The previous prime is 133633. The next prime is 133649. The reversal of 133642 is 246331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246331 = 313 ⋅787.

It can be written as a sum of positive squares in only one way, i.e., 128881 + 4761 = 359^2 + 69^2 .

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (133649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33409 + ... + 33412.

2¹³³⁶⁴² is an apocalyptic number.

133642 is a deficient number, since it is larger than the sum of its proper divisors (66824).

133642 is an equidigital number, since it uses as much as digits as its factorization.

133642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66823.

The product of its digits is 432, while the sum is 19.

The square root of 133642 is about 365.5707865790. The cubic root of 133642 is about 51.1266874741.

Adding to 133642 its reverse (246331), we get a palindrome (379973).

It can be divided in two parts, 13364 and 2, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 133642 in words is "one hundred thirty-three thousand, six hundred forty-two".