133999956 has 18 divisors (see below), whose sum is σ = 338722202. Its totient is φ = 44666640.

The previous prime is 133999939. The next prime is 133999979. The reversal of 133999956 is 659999331.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 120560400 + 13439556 = 10980^2 + 3666^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1861075 + ... + 1861146.

Almost surely, 2^133999956 is an apocalyptic number.

It is an amenable number.

133999956 is an abundant number, since it is smaller than the sum of its proper divisors (204722246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133999956 is a wasteful number, since it uses less digits than its factorization.

133999956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722231 (or 3722226 counting only the distinct ones).

The product of its digits is 1771470, while the sum is 54.

The square root of 133999956 is about 11575.8350022795. The cubic root of 133999956 is about 511.7229386817.

The spelling of 133999956 in words is "one hundred thirty-three million, nine hundred ninety-nine thousand, nine hundred fifty-six".