33438240 has 144 divisors (see below), whose sum is σ = 124540416. Its totient is φ = 8102400.

The previous prime is 33438239. The next prime is 33438241. The reversal of 33438240 is 4283433.

It is an interprime number because it is at equal distance from previous prime (33438239) and next prime (33438241).

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×33438240² = 2236231788595200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33438241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14785 + ... + 16895.

It is an arithmetic number, because the mean of its divisors is an integer number (864864).

Almost surely, 2^33438240 is an apocalyptic number.

33438240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33438240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62270208).

33438240 is an abundant number, since it is smaller than the sum of its proper divisors (91102176).

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

33438240 is a wasteful number, since it uses less digits than its factorization.

33438240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143 (or 2132 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 33438240 is about 5782.5807387359. The cubic root of 33438240 is about 322.1670622098.

The spelling of 33438240 in words is "thirty-three million, four hundred thirty-eight thousand, two hundred forty".