33491440 has 40 divisors (see below), whose sum is σ = 79155648. Its totient is φ = 13175040.

The previous prime is 33491417. The next prime is 33491441. The reversal of 33491440 is 4419433.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×33491440² = 2243353106547200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33491399 and 33491408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33491441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1449 + ... + 8311.

Almost surely, 2^33491440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33491440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39577824).

33491440 is an abundant number, since it is smaller than the sum of its proper divisors (45664208).

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

33491440 is a wasteful number, since it uses less digits than its factorization.

33491440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6937 (or 6931 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 33491440 is about 5787.1789327789. The cubic root of 33491440 is about 322.3378268418.

The spelling of 33491440 in words is "thirty-three million, four hundred ninety-one thousand, four hundred forty".