33821240 has 16 divisors (see below), whose sum is σ = 76097880. Its totient is φ = 13528480.

The previous prime is 33821237. The next prime is 33821251. The reversal of 33821240 is 4212833.

It is a super-2 number, since 2×33821240² = 2287752550275200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422726 + ... + 422805.

Almost surely, 2^33821240 is an apocalyptic number.

It is an amenable number.

33821240 is an abundant number, since it is smaller than the sum of its proper divisors (42276640).

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

33821240 is a wasteful number, since it uses less digits than its factorization.

33821240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845542 (or 845538 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 33821240 is about 5815.6031501470. The cubic root of 33821240 is about 323.3924243391.

The spelling of 33821240 in words is "thirty-three million, eight hundred twenty-one thousand, two hundred forty".