133876409 has 4 divisors (see below), whose sum is σ = 135202020. Its totient is φ = 132550800.

The previous prime is 133876403. The next prime is 133876423. The reversal of 133876409 is 904678331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 904678331 = 19 ⋅47614649.

It can be written as a sum of positive squares in 2 ways, for example, as 114490000 + 19386409 = 10700^2 + 4403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133876409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133876403) 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, 662654 + ... + 662855.

It is an arithmetic number, because the mean of its divisors is an integer number (33800505).

Almost surely, 2^133876409 is an apocalyptic number.

It is an amenable number.

133876409 is a deficient number, since it is larger than the sum of its proper divisors (1325611).

133876409 is a wasteful number, since it uses less digits than its factorization.

133876409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325610.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 133876409 is about 11570.4973531824. The cubic root of 133876409 is about 511.5656220283.

The spelling of 133876409 in words is "one hundred thirty-three million, eight hundred seventy-six thousand, four hundred nine".