133878243 has 16 divisors (see below), whose sum is σ = 188762112. Its totient is φ = 84264000.

The previous prime is 133878229. The next prime is 133878263. The reversal of 133878243 is 342878331.

It is not a de Polignac number, because 133878243 - 2⁵ = 133878211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133878223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13743 + ... + 21368.

It is an arithmetic number, because the mean of its divisors is an integer number (11797632).

Almost surely, 2^133878243 is an apocalyptic number.

133878243 is a deficient number, since it is larger than the sum of its proper divisors (54883869).

133878243 is a wasteful number, since it uses less digits than its factorization.

133878243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35186.

The product of its digits is 96768, while the sum is 39.

The square root of 133878243 is about 11570.5766062025. The cubic root of 133878243 is about 511.5679580313.

The spelling of 133878243 in words is "one hundred thirty-three million, eight hundred seventy-eight thousand, two hundred forty-three".