133978 has 8 divisors (see below), whose sum is σ = 216468. Its totient is φ = 61824.

The previous prime is 133967. The next prime is 133979. The reversal of 133978 is 879331.

It can be written as a sum of positive squares in 2 ways, for example, as 131769 + 2209 = 363^2 + 47^2 .

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

It is not an unprimeable number, because it can be changed into a prime (133979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2551 + ... + 2602.

2¹³³⁹⁷⁸ is an apocalyptic number.

133978 is a deficient number, since it is larger than the sum of its proper divisors (82490).

133978 is a wasteful number, since it uses less digits than its factorization.

133978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5168.

The product of its digits is 4536, while the sum is 31.

The square root of 133978 is about 366.0300534109. The cubic root of 133978 is about 51.1694988417.

It can be divided in two parts, 133 and 978, that added together give a palindrome (1111).

The spelling of 133978 in words is "one hundred thirty-three thousand, nine hundred seventy-eight".