33853981 has 4 divisors (see below), whose sum is σ = 38690272. Its totient is φ = 29017692.

The previous prime is 33853979. The next prime is 33853997. The reversal of 33853981 is 18935833.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 33853981 - 2¹ = 33853979 is a prime.

It is a super-3 number, since 3×33853981³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33853931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2418135 + ... + 2418148.

It is an arithmetic number, because the mean of its divisors is an integer number (9672568).

Almost surely, 2^33853981 is an apocalyptic number.

It is an amenable number.

33853981 is a deficient number, since it is larger than the sum of its proper divisors (4836291).

33853981 is an equidigital number, since it uses as much as digits as its factorization.

33853981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4836290.

The product of its digits is 77760, while the sum is 40.

The square root of 33853981 is about 5818.4173965091. The cubic root of 33853981 is about 323.4967451400.

The spelling of 33853981 in words is "thirty-three million, eight hundred fifty-three thousand, nine hundred eighty-one".