133898 has 4 divisors (see below), whose sum is σ = 200850. Its totient is φ = 66948.

The previous prime is 133877. The next prime is 133919. The reversal of 133898 is 898331.

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

It is an interprime number because it is at equal distance from previous prime (133877) and next prime (133919).

It can be written as a sum of positive squares in only one way, i.e., 82369 + 51529 = 287^2 + 227^2 .

It is a Curzon number.

It is an unprimeable number.

133898 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33473 + ... + 33476.

2¹³³⁸⁹⁸ is an apocalyptic number.

133898 is a deficient number, since it is larger than the sum of its proper divisors (66952).

133898 is an equidigital number, since it uses as much as digits as its factorization.

133898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66951.

The product of its digits is 5184, while the sum is 32.

The square root of 133898 is about 365.9207564487. The cubic root of 133898 is about 51.1593121570.

The spelling of 133898 in words is "one hundred thirty-three thousand, eight hundred ninety-eight".