133688042 has 4 divisors (see below), whose sum is σ = 200532066. Its totient is φ = 66844020.

The previous prime is 133688021. The next prime is 133688063. The reversal of 133688042 is 240886331.

It is a happy number.

133688042 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (133688021) and next prime (133688063).

It can be written as a sum of positive squares in only one way, i.e., 130622041 + 3066001 = 11429^2 + 1751^2 .

It is a junction number, because it is equal to n+sod(n) for n = 133687993 and 133688011.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33422009 + ... + 33422012.

Almost surely, 2^133688042 is an apocalyptic number.

133688042 is a deficient number, since it is larger than the sum of its proper divisors (66844024).

133688042 is an equidigital number, since it uses as much as digits as its factorization.

133688042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66844023.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 133688042 is about 11562.3545180037. The cubic root of 133688042 is about 511.3255814513.

The spelling of 133688042 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, forty-two".