133857897 has 16 divisors (see below), whose sum is σ = 184023360. Its totient is φ = 86484672.

The previous prime is 133857877. The next prime is 133857917. The reversal of 133857897 is 798758331.

It is an interprime number because it is at equal distance from previous prime (133857877) and next prime (133857917).

It is not a de Polignac number, because 133857897 - 2¹¹ = 133855849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133857827) 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, 27618 + ... + 32100.

It is an arithmetic number, because the mean of its divisors is an integer number (11501460).

Almost surely, 2^133857897 is an apocalyptic number.

It is an amenable number.

133857897 is a deficient number, since it is larger than the sum of its proper divisors (50165463).

133857897 is a wasteful number, since it uses less digits than its factorization.

133857897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4792.

The product of its digits is 1270080, while the sum is 51.

The square root of 133857897 is about 11569.6973599140. The cubic root of 133857897 is about 511.5420417242.

The spelling of 133857897 in words is "one hundred thirty-three million, eight hundred fifty-seven thousand, eight hundred ninety-seven".