133878237 has 8 divisors (see below), whose sum is σ = 187899360. Its totient is φ = 84554640.

The previous prime is 133878229. The next prime is 133878263. The reversal of 133878237 is 732878331.

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

It is not a de Polignac number, because 133878237 - 2³ = 133878229 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133878287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1174314 + ... + 1174427.

It is an arithmetic number, because the mean of its divisors is an integer number (23487420).

Almost surely, 2^133878237 is an apocalyptic number.

It is an amenable number.

133878237 is a deficient number, since it is larger than the sum of its proper divisors (54021123).

133878237 is a wasteful number, since it uses less digits than its factorization.

133878237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348763.

The product of its digits is 169344, while the sum is 42.

The square root of 133878237 is about 11570.5763469241. The cubic root of 133878237 is about 511.5679503890.

The spelling of 133878237 in words is "one hundred thirty-three million, eight hundred seventy-eight thousand, two hundred thirty-seven".