133978977 has 24 divisors (see below), whose sum is σ = 211536000. Its totient is φ = 81038880.

The previous prime is 133978967. The next prime is 133979039. The reversal of 133978977 is 779879331.

It is a happy number.

It is not a de Polignac number, because 133978977 - 2⁶ = 133978913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133978907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66024 + ... + 68022.

It is an arithmetic number, because the mean of its divisors is an integer number (8814000).

Almost surely, 2^133978977 is an apocalyptic number.

It is an amenable number.

133978977 is a deficient number, since it is larger than the sum of its proper divisors (77557023).

133978977 is a wasteful number, since it uses less digits than its factorization.

133978977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693 (or 2690 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 54.

The square root of 133978977 is about 11574.9288118761. The cubic root of 133978977 is about 511.6962322157.

The spelling of 133978977 in words is "one hundred thirty-three million, nine hundred seventy-eight thousand, nine hundred seventy-seven".