133139978 has 8 divisors (see below), whose sum is σ = 206152320. Its totient is φ = 64422540.

The previous prime is 133139977. The next prime is 133139983. The reversal of 133139978 is 879931331.

133139978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 (133139977) 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, 1073648 + ... + 1073771.

It is an arithmetic number, because the mean of its divisors is an integer number (25769040).

Almost surely, 2^133139978 is an apocalyptic number.

133139978 is a deficient number, since it is larger than the sum of its proper divisors (73012342).

133139978 is a wasteful number, since it uses less digits than its factorization.

133139978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147452.

The product of its digits is 122472, while the sum is 44.

The square root of 133139978 is about 11538.6298146704. The cubic root of 133139978 is about 510.6258854338.

The spelling of 133139978 in words is "one hundred thirty-three million, one hundred thirty-nine thousand, nine hundred seventy-eight".