33837981 has 16 divisors (see below), whose sum is σ = 46157760. Its totient is φ = 22043520.

The previous prime is 33837977. The next prime is 33838039. The reversal of 33837981 is 18973833.

It is not a de Polignac number, because 33837981 - 2² = 33837977 is a prime.

It is a super-2 number, since 2×33837981² = 2290017916312722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33837901) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 32241 + ... + 33273.

It is an arithmetic number, because the mean of its divisors is an integer number (2884860).

Almost surely, 2^33837981 is an apocalyptic number.

It is an amenable number.

33837981 is a deficient number, since it is larger than the sum of its proper divisors (12319779).

33837981 is a wasteful number, since it uses less digits than its factorization.

33837981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276.

The product of its digits is 108864, while the sum is 42.

The square root of 33837981 is about 5817.0422896864. The cubic root of 33837981 is about 323.4457736501.

The spelling of 33837981 in words is "thirty-three million, eight hundred thirty-seven thousand, nine hundred eighty-one".