33991394 has 4 divisors (see below), whose sum is σ = 50987094. Its totient is φ = 16995696.

The previous prime is 33991369. The next prime is 33991499. The reversal of 33991394 is 49319933.

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

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 13786369 = 4495^2 + 3713^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8497847 + ... + 8497850.

Almost surely, 2^33991394 is an apocalyptic number.

33991394 is a deficient number, since it is larger than the sum of its proper divisors (16995700).

33991394 is a wasteful number, since it uses less digits than its factorization.

33991394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16995699.

The product of its digits is 78732, while the sum is 41.

The square root of 33991394 is about 5830.2138897299. The cubic root of 33991394 is about 323.9338443907.

The spelling of 33991394 in words is "thirty-three million, nine hundred ninety-one thousand, three hundred ninety-four".