133879385 has 4 divisors (see below), whose sum is σ = 160655268. Its totient is φ = 107103504.

The previous prime is 133879381. The next prime is 133879409. The reversal of 133879385 is 583978331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60964864 + 72914521 = 7808^2 + 8539^2 .

It is a cyclic number.

It is not a de Polignac number, because 133879385 - 2² = 133879381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133879381) 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, 13387934 + ... + 13387943.

It is an arithmetic number, because the mean of its divisors is an integer number (40163817).

Almost surely, 2^133879385 is an apocalyptic number.

It is an amenable number.

133879385 is a deficient number, since it is larger than the sum of its proper divisors (26775883).

133879385 is an equidigital number, since it uses as much as digits as its factorization.

133879385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26775882.

The product of its digits is 544320, while the sum is 47.

The square root of 133879385 is about 11570.6259554097. The cubic root of 133879385 is about 511.5694126091.

The spelling of 133879385 in words is "one hundred thirty-three million, eight hundred seventy-nine thousand, three hundred eighty-five".